Sonoma County

State Route 12 (SR 12) is a state highway in the U.S. state of California that travels in an east–west direction from State Route 116 in Sebastopol in Sonoma County to State Route 49 just north of San Andreas in Calaveras County. The route connects the Sonoma and Napa valleys with the Sacramento–San Joaquin River Delta and the Sierra Foothills. It is constructed to freeway standards from the Fulton Road/South Wright Road stoplight in Santa Rosa, to its partial interchange with Farmers Lane (also in Santa Rosa).

The Diocese of Santa Rosa in California (Latin: Diœcesis Sanctae Rosae in California) is a Latin Church diocese, or ecclesiastical territory, of the Catholic Church in the northern California region of the United States. It is a suffragan diocese of the ecclesiastical province of the metropolitan Archdiocese of San Francisco.

Luther Burbank's Gold Ridge Experiment Farm is the official name of the 3 acres (12,000 m²) that remain of the farm originally purchased in 1885 by famed plant breeder Luther Burbank (1849–1926) in an area of Sebastopol, California, formerly known as the "Gold Ridge District". To these 10 acres (40,000 m²), Burbank added 5 acres (20,000 m²) in 1904 and 3.046 acres (12,330 m²) in 1906 until, in 1923, failing health compelled him to sell 3.046 acres (12,330 m²) of his holdings. Burbank died in 1926.

The Green Valley of Russian River Valley AVA (formerly Sonoma County Green Valley AVA) is an American Viticultural Area in Sonoma County, California, United States. Located at the southwestern corner of the Russian River Valley AVA, its close proximity to the Pacific Ocean makes it one of the coolest appellations within Sonoma County. The climate in the Green Valley is even cooler than other parts of the Russian River Valley, and favors the cultivation of cool climate varietals like Pinot noir, Chardonnay and Gewürztraminer.

The Mayacamas Mountains are located in northwestern California in the United States. The mountain range is part of the Northern Inner Coast Ranges, of the California Coast Ranges System.

KOSC (89.9 FM) is a non-commercial radio station licensed to Angwin, California, United States, and serving the Santa Rosa area. The station broadcasts a classical music format as a full-time simulcast of KDFC in San Francisco. It is owned by the University of Southern California. KDFC is the radio home of the San Francisco Symphony and the San Francisco Opera.

KSXY (100.9 FM, "Latino 100.9") is a Spanish contemporary hit radio formatted radio station licensed to Forestville, California, United States. It is owned by Wine Country Radio.

KEMO-TV (channel 50) is a television station licensed to Fremont, California, United States, serving the San Francisco Bay Area with programming from Fubo Sports Network. The station is owned by Innovate Corp. KEMO-TV's transmitter is located at San Francisco's Sutro Tower, and is shared with KMTP-TV, KCNS, and KTNC-TV.

Dry Creek Valley is an American Viticultural Area (AVA) in Sonoma County, California, located northwest of the town of Healdsburg. It was established on August 3, 1983 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted on behalf of the Dry Creek Valley Association, Inc., a local grape/wine industry member group, proposing a viticultural area to be known as "Dry Creek Valley." The inverted "U"-shaped valley extends southeasterly just east of the Warm Springs Creek/Dry Creek confluence, a tributary of the Russian River south of Healdsburg and is approximately 16 miles (25.7 km) long by two miles (3.2 km) wide. The appellation benefits from the proximity of the Lake Sonoma reservoir for irrigation in this relatively dry area.

The Alexander Valley (Wappo: Unutsawaholmanoma, "Toyon Bush Berry Place") is a Californian American Viticultural Area (AVA) just north of Healdsburg in Sonoma County. It is home to many wineries and vineyards, as well as the city of Cloverdale. It is the largest and most fully planted wine region in Sonoma. Highway 101 runs through the valley, and the Russian River flows down the valley, surrounded by vineyards on both sides. From the higher elevations of the valley rim, there is a view as far south as Taylor Mountain and Sonoma Mountain. The region was named for Cyrus Alexander, owner of a part of the Rancho Sotoyome Mexican land grant, in 1847. Granted AVA status in 1984, the boundaries of the appellation are defined in the Code of Federal Regulations, Title 27, Section 9.53.

The North Coast AVA is an American Viticultural Area in the state of California that encompasses grape-growing regions in six counties located north of San Francisco: Lake, Marin, Mendocino, Napa, Sonoma, and Solano. This large appellation covers over 3,000,000 acres (5,000 sq mi) and includes a number of smaller sub-appellations that all share the common ecology trait of weather affected by the fog and breezes off the Pacific Ocean.

Geyserville (formerly Clairville) is an unincorporated community and census-designated place (CDP) in Sonoma County, California, United States. Located in the Wine Country, Geyserville has a small selection of restaurants, bed and breakfasts, and wineries. Geyserville is located on California State Route 128, close to US Route 101. The population was 862 at the 2010 census.

The Dry Creek Rancheria Band of Pomo Indians is a federally recognized tribe of Pomo people, an Indigenous people of California. The tribe has a reservation near Geyserville, California, in Sonoma County, where it operates the River Rock Casino Resort.

KFGY (92.9 FM) is a commercial radio station licensed to Healdsburg, California, broadcasting to the Santa Rosa, California, area.

The Kincade Fire was a wildfire that burned in Sonoma County, California in the United States. The fire started northeast of Geyserville in The Geysers at 9:24 p.m. on October 23, 2019, and subsequently burned 77,758 acres (31,468 ha) until the fire was fully contained on November 6, 2019. The fire threatened over 90,000 structures and caused widespread evacuations throughout Sonoma County, including the communities of Geyserville, Healdsburg, Windsor, and Santa Rosa. The majority of Sonoma County and parts of Lake County were under evacuation warnings and orders. Lake county only had one evacuation order and that was the town of Middletown. The fire was the largest of the 2019 California wildfire season, and also the largest wildfire recorded in Sonoma County at the time before being surpassed by the LNU Lightning Complex fires in 2020.

The Geyserville Union School on Main St. in Geyserville, California was built in 1921. It was a work of Henry C. Smith. It was listed on the National Register of Historic Places in 1979.

The Healdsburg Fault is a seismically active geological feature associated with the Santa Rosa Plain and the Alexander Valley, in Sonoma County, California, United States. The eastern sides of these floodplains are bounded by strike-slip or transform faults. The maximum credible earthquake expected to be generated from the Healdsburg Fault is estimated to be about 7.5 on the Richter scale.

Jordan Vineyard & Winery is an independently owned California winery located in Alexander Valley AVA in Sonoma County. Jordan produces Alexander Valley Cabernet Sauvignon and Russian River Valley Chardonnay.

KXTS (98.7 MHz) is an FM radio station broadcasting a Regional Mexican format. Licensed to Geyserville, California, United States, it serves the Santa Rosa area. The station is currently owned by Wine Country Radio. The station had previously been broadcasting on 100.9 FM until a frequency swap with KSXY on February 8, 2008. The call signs had been swapped the previous week.

The California Coast Ranges Biosphere Reserve (established 1983) was a UNESCO Biosphere reserve located along the California Coast Ranges of northern California and the San Francisco Bay area until June 2017. This biosphere reserve includes a highly diverse complex of evergreen sclerophyllous woodland, coastal, estuary and marine ecosystems.

Mercuryville, California is a ghost town in the Mayacamas Mountains of Sonoma County, California along The Geysers road.

KNOB (96.7 MHz) is a commercial FM radio station licensed to Healdsburg, California, and broadcasting to the Santa Rosa area. It is owned by JYH Broadcasting and operated by Wine Country Radio and it airs an adult hits radio format, branded as "Bob FM". The studios and offices are on Standish Avenue in Santa Rosa.

KRSH (95.9 FM) is a commercial radio station in Healdsburg, California, broadcasting to the Santa Rosa, California, area.

Rancho Caslamayomi was a 26,788-acre (108.41 km²) Mexican land grant in present-day Sonoma County, California given in 1844 by Governor Manuel Micheltorena to Eugenio Montenegro. The grant extended along Little Sulphur Creek in the Mayacamas Mountains north of Healdsburg.

Rancho Tzabaco was a 15,439-acre (62.48 km²) Mexican land grant in present-day Sonoma County, California given in 1843 by Governor Manuel Micheltorena to José German Piña (often misspelled as "Pena" in historical documents). The grant extended along Dry Creek, a tributary of the Russian River, north west of present-day Healdsburg and encompassed present-day Geyserville and the Dry Creek Valley AVA. The grant was immediately north of Henry D. Fitch's Rancho Sotoyome.

Rockpile is an American Viticultural Area (AVA) located in northern-most area of Sonoma County, California overlapping the northwestern corner of Dry Creek Valley appellation and adjacent to the southwestern shores of Lake Sonoma on the southern Mendocino Range. It was established on February 27, 2002 as the Sonoma County's 12th appellation by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by Jack W. Florence Sr. on behalf of the Rockpile Appellation Committee, proposing a viticultural area named "Rockpile." The viticultural area encompasses approximately 15,400 acres (24 sq mi) containing eleven vineyards cultivating about 160 acres (65 ha) that lie at or are above the 800 feet (240 m) contour line.

KSRT (107.1 FM) is a commercial radio station broadcasting a Regional Mexican radio format. Licensed to Cloverdale, California, United States, it serves the Santa Rosa area. The station is currently owned by Lazer Media.

Rancho Rincon de Musalacon was a 8,867-acre (35.88 km²) Mexican land grant in present-day Sonoma County, California given in 1846 by Governor Pío Pico to Francisco Berreyesa. The grant extended along both sides of the Russian River and encompassed present-day Cloverdale and Asti.

The Girdle is a mountain range in Sonoma County, California.

The Point Fire was a wildfire that burned near Healdsburg in Sonoma County, California in the United States. The fire burned 1,207 acres of wildland and wineries after igniting on June 16, 2024 amid red flag conditions that plagued much of the area at the time of the fire. The fire was fully contained eight days later on June 24, 2024.

The Wheatfield Fork Gualala River is a 35.1-mile-long (56.5 km) stream in the mountains of western Sonoma County, California which empties into the South Fork Gualala River just east of Sea Ranch, California.

Rancho German (also called "Rancho de Hermann" or "Rancho de Ross") was a 17,580-acre (71.1 km²) Mexican land grant in present day Sonoma County, California given in 1846 by Governor Pío Pico to Ernest Rufus. Rufus named the ranch after Hermann, the German hero who defeated the Roman legions in the Battle of the Teutoburg Forest at the time of the Emperor Augustus. Herman, in Spanish, would be written "German". The name "Rancho de Hermann" appears on the diseno, but the expediente has "German". The grant extended along the Pacific coast from the Gualala River on the north to Salt Point State Park on the south, and included present day Gualala, Sea Ranch and Stewart's Point.

KHTH (101.7 FM) is a commercial radio station in Santa Rosa, California, broadcasting a contemporary hit radio (Top 40/CHR) radio format. It is owned by Lawrence Amaturo.

Rancho Mallacomes (also called Moristul and Mallacomes y Plano de Agua Caliente) was a 17,742-acre (71.80 km²) Mexican land grant in present-day Napa County and Sonoma County, California given in 1843 by Governor Manuel Micheltorena to José de los Santos Berreyesa.

The Monte Vista and Diamond Mountain Vineyard, at 2121 Diamond Mountain Rd. in Calistoga, California, was listed on the National Register of Historic Places in 2013. The listing included five contributing buildings and a contributing site.

Madrona Manor is a Victorian-era Wine Country bed and breakfast inn near Healdsburg, in Sonoma County, California, United States, featuring a Michelin-starred restaurant.

Chalk Hill AVA is an American Viticultural Area (AVA) located in Sonoma County, California. The boundaries of the wine appellation cover the northeast corner of the Russian River Valley AVA. The majority of vineyards are located to the east of U.S. Route 101, near the town of Windsor. The name Chalk Hill comes from the unique volcanic soil of chalky white ash which has shown itself to perform well with planting of white wine varietals like Chardonnay and Sauvignon blanc. The majority of the region's wineries are located on the western slopes of the Mayacamas Mountains.

Forestville is a census-designated place (CDP) in Sonoma County, California, United States. It was settled during the late 1860s and was originally spelled Forrestville after one of its founders. The spelling long ago became standardized with one "r". The population was 3,293 at the 2010 census, an increase of nearly 1,000 since the 2000 census.

Northern Sonoma is an American Viticultural Area (AVA) in Sonoma County, California. The appellation covers most of the county with the notable exceptions of the Los Carneros AVA, Petaluma Gap AVA and Sonoma Valley AVA wine regions, which are located in the southern portion of the county. It was established on May 16, 1985 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition proposing the viticultural area named "Northern Sonoma." The creation of the Northern Sonoma AVA was largely based on the petitioning of the E & J Gallo Winery as part of their expansion of their Gallo of Sonoma brand. The viticultural area entirely encompasses Alexander Valley AVA, Chalk Hill AVA, Dry Creek Valley AVA, Knights Valley AVA, Russian River Valley AVA, Sonoma Coast AVA appellations,and portions of the Green Valley of Russian River Valley AVA and Rockpile AVA.

Knights Valley is an American Viticultural Area (AVA) located in Sonoma County, California. As one of the five original viticultural areas in the county, Knights Valley was established on October 21, 1983 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by The Knights Valley Wine-Growers Committee, an organization of grape/wine industry members, signed by 16 persons, to establish a viticultural area in northeastern Sonoma County named "Knights Valley." The area encompasses approximately 36,240 acres (57 sq mi) with over 30 growers cultivating 2,000 acres (809 ha) under vine. In the easternmost Sonoma County region, Knights Valley has the warmest climate in the county. The northernmost section of the boundary line runs slightly to the north of Pine Mountain; the southernmost section of the boundary line borders the petrified forest area immediately to the north of Porter Creek. The Sonoma County line bordering Lake County and Napa County forms the eastern section of the boundary of the viticultural area. The easternmost section of the boundary line abuts the boundaries for the Alexander Valley and Chalk Hill viticultural areas. The appellation is the border separating Sonoma County from the Napa Valley.

The Laguna de Santa Rosa is a 22-mile-long (35 km) wetland complex that drains a 254-square-mile (660 km²) watershed encompassing most of the Santa Rosa Plain in Sonoma County, California, United States.

Russian River Valley is an American Viticultural Area (AVA) in Sonoma County, California. Centered on the Russian River, the Russian River Valley AVA accounts for about one-sixth of the total planted vineyard acreage in Sonoma County. The appellation was granted AVA status in 1983 and enlarged in 2005. The area generally lies between Sebastopol and Santa Rosa in the south, and Forestville and Healdsburg in the north. The Russian River Valley has a characteristically cool climate, heavily affected by fog generated by the valley's proximity to the Pacific Ocean. The area is known for its success with cool climate varietals, notably Pinot noir and Chardonnay.

Simi Winery is a winery in California in the United States.

Larkfield-Wikiup is a census-designated place, unincorporated area in Sonoma County, California, United States. The population was 8,884 at the 2010 census, up from 7,479 at the 2000 census. It comprises the Mark West area between Santa Rosa (to the south), Windsor (north), Calistoga (east), and Fulton (west). There are at least four schools within the limits of the CDP, including Cardinal Newman High School, John B. Riebli Elementary School, Mark West Elementary, and San Miguel Elementary schools.

At 04:56 and 06:19 UTC on October 2, 1969 (21:56 and 23:19 PDT October 1), a pair of earthquakes of magnitude 5.6 and 5.7, respectively, struck the city of Santa Rosa, California, killing one person and damaging buildings. The maximum felt intensity for the two events was VII (Very strong) and VIII (Severe) respectively on the Mercalli intensity scale. The $8.35 million cost of the earthquakes went mostly to replace buildings damaged beyond repair. There were at least 200 aftershocks after the initial pair of earthquakes. At the time they were the largest earthquakes to affect the northern San Francisco Bay Area since the 1906 San Francisco earthquake.

Altruria was a short-lived utopian commune in Sonoma County, California, based on Christian socialist principles and inspired by William Dean Howells's 1894 novel, A Traveler from Altruria.

Benovia Winery is a family-owned producer of Pinot noir, Chardonnay, and Zinfandel wines in Santa Rosa, California. Founded in 2005 by Joe Anderson and Mary Dewane, Benovia Winery farms three estate vineyards which total 71.67 acres (290,000 m²) and are located in the Russian River Valley AVA and Sonoma Coast AVA in Sonoma County. To supplement the fruit it harvests each year, Benovia purchases additional grapes from two sites farmed by the Martinelli family. Benovia's winemaker, Mike Sullivan, is also co-owner of the winery. Benovia wines are produced and bottled at the winery's winemaking facilities at the Martaella Estate Vineyard in the Russian River Valley AVA. Annual production is approximately 6,000 cases. Benovia wines are sold direct to customers, as well as distributed to restaurants and other retailers for resale.

DeLoach Vineyards was started in 1975 by Cecil DeLoach, Christine DeLoach, Berle Beliz and Jack Fleming, and was one of the first wineries established in the Russian River Valley, Sonoma County, California after Prohibition.

Empire College is a private for-profit college in Santa Rosa, California. Founded in 1961, The college offers business and law degrees and was formerly accredited by the Accrediting Council for Independent Colleges and Schools (ACICS). However, in 2016 the United States Secretary of Education denied ACICS's accrediting status for failing to meet 21 recognition criteria. It is accredited by the Committee of Bar Examiners of the State Bar of California. In February 2020, the school announced that it was closing its School of Business over the next 18 months, citing lower enrollment that was worsened by three years of wildfires.

The Empire College School of Law, part of Empire College and founded in 1973, is a four-year evening law school program approved by the Committee of Bar Examiners of the State Bar of California. As an evening-only law school, the School of Law is not accredited by the American Bar Association. As a result, graduates are generally only eligible to take the bar and practice law in California. Empire Law School's professors are practicing attorneys and judges from the North Bay area who teach in their specialty areas.

Fountain Grove was a utopian colony founded near Santa Rosa, California, by Thomas Lake Harris in 1875. Most of its settlers were followers of Harris's Brotherhood of the New Life and moved with Harris from their previous colony at Brocton, New York.

Fulton is a census-designated place (CDP) in Sonoma County, California, United States. Fulton is just to the north of the city limits of Santa Rosa, and 7 miles (11 km) north-northeast of Sebastopol. Fulton has a post office, established in 1871 and assigned ZIP code 95439. The community is named after Thomas and James Fulton, who founded the community. The population as of the 2010 U.S. Census was 541. There are a set of railway lines which go through the town boundaries; these lines are used by Sonoma–Marin Area Rail Transit (or the SMART Train). Fulton was once home to a chicken processing plant that was in operation from the 1960s until its closure in 2010.

Mark West is an unincorporated community immediately north of Santa Rosa, California in Sonoma County, California, United States. Mark West is located along Mark West Springs Road adjacent to U.S. Highway 101. The community of Mark West is named for Scottish American pioneer William Marcus West.

Windsor Vineyards is a winery located in Windsor, California, United States. It is one of the largest direct-to-consumer wineries located in the United States.

Cooper's Sawmill is a California Historical Landmark located almost two miles north of Forestville, California, and is located in the jurisdiction of Santa Rosa, in the United States. It was the site of the first power-operated sawmill used for commercial purposes in California.

The Honor Mansion is a historic building located in Healdsburg, California, United States. Built in 1883, the mansion remained in the same family until 1994. It is now a bed and breakfast accommodation.

Rodney Strong Vineyards is a family-owned winery based in Healdsburg, California, United States. It was founded in 1959 by wine pioneer and former dancer, Rodney Strong, the winery focuses solely on Sonoma County grape growing and wines. Rodney Strong Vineyards sources from throughout Sonoma County and has 14 estate vineyards located in Alexander Valley, Russian River Valley, Chalk Hill, Sonoma Coast and Dry Creek Valley. It was recognized as American Winery of the Year in 2013 by Wine Enthusiast Magazine.

Green Valley Creek is a 10.7-mile-long (17.2 km) stream in Sonoma County, California, United States, which springs from the hills above the Bohemian Grove and is a tributary of the Russian River.

The Hand Fan Museum is a museum of hand fans located in Healdsburg, California, United States. It is the only fan museum in the USA.

The Healdsburg Transfer Station is a solid waste recycling and reuse facility in Sonoma County, California, located at 166 Alexander Valley Road, north of the City of Healdsburg. It is privately owned by Republic Services along with all other former Sonoma County transfer stations as of April 1, 2015. Its coordinates are 38.6515°N 122.8686°W / 38.6515; -122.8686.

J Vineyards & Winery is a California winery located in the Russian River Valley AVA of Sonoma County, California, owned and operated by E & J Gallo since 2015.

KJOR (104.1 FM) is a radio station broadcasting a Classic Regional Mexican and Ranchera music radio format. Licensed to Windsor, California, United States, it serves the Santa Rosa area. The station is currently owned by Lazer Media.

KVRV (97.7 FM, "The River") is a commercial radio station licensed to Monte Rio, California, broadcasting to the Santa Rosa, California area.

Pepperwood Preserve is a 3,117-acre plot of land owned by the Pepperwood Foundation, located in the Mayacamas Mountains in the coast ranges of California near the towns of Santa Rosa and Healdsburg in Sonoma County. The preserve includes the headwaters of Mark West Creek, Franz Creek, and Brooks Creek all of which feed into the Russian River. The highest point on the preserve is 1,560 feet (480 m).

Rancho El Molino was a 17,892-acre (72.41 km²) Mexican land grant in present-day Sonoma County, California granted by Governor José Figueroa in 1833 to John B.R. Cooper. The grant was officially confirmed by Governor Nicolás Gutiérrez in 1836. "Molino" means "mill" in Spanish, and the name refers to Cooper's sawmill. The grant extends south from Russian River along Atascadero Creek, and encompasses present-day Forestville.

Rancho San Miguel was a 6,663-acre (26.96 km²) Mexican land grant in present-day Sonoma County, California given in 1840 by Governor Juan B. Alvarado to William Marcus West. The grant was located north of present-day Santa Rosa, between Mark West Creek and Santa Rosa Creek, and encompassed present-day Mark West and Mark West Springs.

Rancho Sotoyome was a 48,837-acre (197.64 km²) Mexican land grant given to Henry D. Fitch. Sotoyome or "Satiyomes" was the name of a Wappo tribe. The grant, in present-day Sonoma County, California, extended along the Russian River encompassing the Alexander Valley and present-day Healdsburg.

Remick Ridge Vineyards is a California-based vineyard and winery owned and operated by the Smothers Brothers. It is a monopole vineyard for Arrowood Vineyards and Winery in the Sonoma Valley. The setting of this viticulture operation is on a ridge of the northern Sonoma Mountains above Sonoma Creek. The name Remick is the maiden name of the brothers' mother and their grandfather, Ed Remick, who lived on the property for 15 years with Tommy. It was established in 1977.

Sonoma Water, formerly known as the Sonoma County Water Agency, maintains a water transmission system that provides naturally filtered Russian River water to more than 600,000 residents in portions of Sonoma County, California and Marin County, California. The Water Agency is a water wholesaler that sells potable water to nine cities and special districts that in turn sell drinking water to their residents. These cities and special districts are: the City of Santa Rosa, Rohnert Park, Cotati, Petaluma, Sonoma, the Town of Windsor, Valley of the Moon Water District, Marin Municipal Water District, and North Marin Water District.

Steelhead Beach Regional Park is a regional park on the Russian River north of Forestville, California, U.S.A. that is maintained by the Sonoma County Regional Parks Department. The day use fee is $7 per vehicle.

Ursuline High School was a private, Roman Catholic, all-girls college-preparatory high school in Santa Rosa, California, in the Diocese of Santa Rosa. It was owned and operated by the Ursuline Sisters of the Roman Union from 1880 to 2011, and was a sister school to Cardinal Newman High School for boys.

Martinelli Winery is located in California’s Russian River Valley and is a family business that has been growing grapes since the 1880s. It is one of the oldest surviving vineyards in Sonoma County.

The James H. and Frances E. Laughlin House, in Sonoma County, California, near Windsor, was built around 1876. It has also been known as Shady Farm. The listing includes four contributing buildings and a contributing structure. It was listed on the National Register of Historic Places in 1979.

The Cunningham-Hembree Estate, in Windsor, California, which includes two houses, was listed on the National Register of Historic Places in 2018.

Walters Ranch Hop Kiln is historical site of buildings built in 1905, in Sonoma, California in Sonoma County, California. The Walters Ranch Hop Kiln is a California Historical Landmark No. 627 listed on January 13, 1958. The Walters Ranch Hop Kiln was built by Italian stonemason, Angelo "'Skinny" Soldini. Sol Walters purchased 380 acres of the Rancho Sotoyome, a 1853 Mexican land grant to Josefa Fitch. The Walters Ranch Hop Kiln is composed of three stone kilns (ovens, Oast houses) for drying hops for 20 hours a patch. Hops are used in beer making breweries. In addition to the kilns, the site as a wooden building for cooling the hops and a two-story press for baling the hops for shipment. The Walters Ranch Hop Kilns was one of early and large operation in the Northern California region.

The Bear Republic Brewing Company is an American microbrewery located in Cloverdale, California. The company was established by the Norgrove family in 1995, with Richard G. Norgrove as brewmaster. The name refers to California's 1846 Bear Flag Revolt. In 2006, Bear Republic was named Small Brewing Company and Small Brewing Company Brewer of the Year at the Great American Beer Festival.

Redwood Empire Food Bank (REFB) is a food bank on the North Coast of California which belongs to the Feeding America network. Its mission is to end hunger in its community.

The Bohemian Grove is a restricted 2,700-acre (1,100-hectare) campground in Monte Rio, California. Founded in 1878, it belongs to a private gentlemen's club known as the Bohemian Club. In mid-July each year, the Bohemian Grove hosts a more than two-week encampment of some of the most prominent men in the world.

KWVF (102.7 FM) is a radio station broadcasting a classic hits format. Licensed to Guerneville, California, United States, the station serves the Santa Rosa area. The station is currently owned by Lawrence V. Amaturo, through licensee Amaturo Sonoma Media Group, LLC.

The Rio Theater is a single-screen movie theater in Monte Rio, California, United States. The largest extant piece of Christo and Jeanne-Claude's Running Fence drapes the ceiling of the theater's auditorium.

The Cazadero Performing Arts Camp (also known as Cazadero Music Camp, or Cazadero) is a performing arts camp located in the Sonoma redwoods in Northern California, United States. Established in 1957 by then Berkeley High School band director Bob Lutt (who eventually was made executive director of the Berkeley Symphony), the first campers were a mixture of Berkeley High teens and members of the San Francisco Symphony.

Timber Cove is a census-designated place (CDP) in Sonoma County, California. Timber Cove sits at an elevation of 554 feet (169 m). The 2010 United States census reported Timber Cove's population was 164.

KGGV-LP (95.1 FM) was a non-commercial all volunteer community radio station broadcasting music, news, and discussion forums. Licensed to Guerneville, California, United States, the station is owned by Multi Media Educational Foundation.

KBBL (106.3 FM; "Air1") is a radio station in Cazadero, California, and serving the Santa Rosa area. It airs a contemporary worship music format. The station is currently owned by Redwood Empire Stereocasters. Educational Media Foundation operates the station under a LMA deal from Redwood, and carries its Air 1 network.

Pond Farm (also known as Pond Farm Workshops) was an American artists’ colony that began in the 1940s and, in one form or another, continued until 1985. It is located near the Russian River resort town of Guerneville, California, about 75 mi (120 km) north of San Francisco. Situated on a hilltop 600 ft (180 m) above the Armstrong Redwoods State Reserve, Pond Farm began around 1939-40 when a San Francisco-based couple named Gordon and Jane Herr (architect and writer, respectively) acquired a portion of property called Rancho Del Lago or the Walker Ranch. Initially 250 acres (1.0 km²), their property was later expanded to 400 acres (1.6 km²). Because one of its primary features was a large pond, the Herrs renamed this setting Pond Farm. It includes two small residences and a historic barn repurposed as a pottery studio.

Rancho Muniz (also called "Maniz") was a 17,761-acre (71.88 km²) Mexican land grant in present-day Sonoma County, California given in 1845 by Governor Pío Pico to Manuel Torres. The grant extended along the Pacific coast from Salt Point State Park on the north to the Russian River on the south. The grant included Fort Ross.

Stillwater Cove is an inlet between the museum and town of Fort Ross, California and Salt Point State Park. The cove is open to the public. Red abalone is hunted in the cove. It is adjacent to Stillwater Cove Regional Park. There is also a nearby ranch.

The Kashia Band of Pomo Indians of the Stewarts Point Rancheria is a federally recognized tribe of Pomo people in Sonoma County, California. They are also known as the Kashaya Pomo.

Glen Ellen is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, United States. The population was 784 at the 2010 census, down from 992 at the 2000 census. Glen Ellen is the location of Jack London State Historic Park (including the Wolf House), Sonoma Valley Regional Park, and a former home of Hunter S. Thompson.

Fetters Hot Springs-Agua Caliente is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, in the United States. As of the 2010 census, the CDP population was 4,144. The name Agua Caliente translates into English, from Spanish, as hot water, referring to the hot springs historically found in the area.

The Sonoma TrainTown Railroad (commonly called "Sonoma Train Town") is a tourist railroad and 10 acre amusement park in Sonoma, California. Its main feature is a 15 in (381 mm) gauge miniature railway, which closely corresponds to a 1:4 scale model of a 4 ft 8+1⁄2 in (1,435 mm) standard gauge railroad.

The Bennett Valley AVA is an American Viticultural Area located in Sonoma County, California. The boundaries of this appellation lie completely within the North Coast AVA, almost completely within the Sonoma Valley AVA and overlaps into some areas of the Sonoma Coast AVA and Sonoma Mountain AVA. The region was granted AVA status on December 23, 2003 following the petition of Matanzas Creek Winery. The AVA is surrounded to the south, east and west by the Sonoma Mountains and to the north by the city of Santa Rosa, California. The region receives a moderating effect on its climate from Pacific Ocean through the cool coastal fogs and breeze that creep into the area from the southwest through Crane Canyon between Sonoma Mountain and Taylor Mountain. Barbera, Cabernet Sauvignon, Cabernet Franc, Chardonnay, Grenache, Merlot, Pinot noir, Sauvignon blanc and Syrah are the leading grape varieties planted.

The Sonoma Valley AVA is an American Viticultural Area in Sonoma County, California which centers on the Sonoma Valley in the southern portion of the county. The name 'Sonoma' means 'Valley of the Moon' in the local Native American dialect. The appellation is bordered by two mountain ranges: the Mayacamas Mountains to the east and the Sonoma Mountains to the west.

El Verano (Spanish for "The Summer") is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, United States. The population was 4,123 at the 2010 census, falling to 3,867 at the 2020 census.

Eldridge is a census-designated place (CDP) in Sonoma County, California, United States. The population was 1,233 at the 2010 census. It is notably the home to the Sonoma Developmental Center, the largest facility serving the needs of persons with developmental disabilities in the state.

The Sonoma Mountain AVA is an American Viticultural Area in Sonoma County, California, United States. It is centered on the Sonoma Mountain landform in the Sonoma Mountains. The appellation includes the town of Glen Ellen, California and is nearly surrounded by the Sonoma Valley AVA. The area is known for the diverse micro-climates that occur on exposed hillsides and shaded drainages, and as such is home to production for a wide range of varieties including Cabernet Sauvignon, Chardonnay, Pinot noir, Sauvignon blanc, Semillon, and Zinfandel.

Boyes Hot Springs (also called Boyes Springs or The Springs) is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, United States. The population was 6,656 people at the 2010 census. Resorts in Boyes Hot Springs, El Verano, Fetters Hot Springs, and Agua Caliente were popular health retreats for tourists from San Francisco and points beyond until the middle of the 20th century because of the geothermic hot springs that still well up from deep within the Earth.

Temelec (Miwok: Tamuleko) is a census-designated place (CDP) in Sonoma County, California, United States. The population was 1,441 at the 2010 census.

Sebastiani Vineyard and Winery also called the San Francisco Solano de Sonoma Mission Vineyard was founded in 1825 in Sonoma, California in Sonoma County, California. The Sebastiani Vineyard and Winery is California Historical Landmark No. 739, listed on June 6, 1960.

Union Hotel and Union Hall Site is historical site of buildings built in 1850, in Sonoma, California in Sonoma County, California. The Union Hotel and Union Hall Site is a California Historical Landmark No. 627 listed on January 13, 1958. The original Union Hotel was a one-story adobe built by three veterans of the Mexican–American War. Next to the Union Hotel was built the Union Hall. The two buildings were lost in 1866 fire. The Union Hotel was rebuilt into a two-story stone hotel. The hotel was on the second floor and a hall was on the first floor. The Union Hotel and Union Hall were on the south side of the Sonoma Plaza.

The Sitting Room Library is a reading room and archive in Penngrove, California, US, that provides the community with access to women's literature and art.

The Orange Lawn, also known as the Young Mansion, is a historic residence located in the Sonoma, California. Built in 1870 by Daniel and Maria Young, it is known for its 19th-century Italianate architecture. The mansion was restored in 1996 and was added to the National Register of Historic Places on June 9, 2008.

The California Republic, or Bear Flag Republic, was an unrecognized breakaway state from Mexico, that for 25 days in 1846 militarily controlled an area north of San Francisco, in and around what is now Sonoma County in California.

The North Bay is a subregion of the San Francisco Bay Area, in California, United States. The largest city is Santa Rosa, which is the fifth-largest city in the Bay Area. It is the location of the Napa and Sonoma wine regions, and is the least populous and least urbanized part of the Bay Area. It consists of Marin, Napa, Solano and Sonoma counties.

Penngrove is a census-designated place (CDP) in Sonoma County, California, United States, situated between the cities of Petaluma and Cotati, at the foot of the western flank of Sonoma Mountain. It is part of the North Bay subregion of the San Francisco Bay Area. The population was 2,522 at the 2010 census.

Hanna Academy, formerly Archbishop Hanna High School is a private, co-ed high school in Sonoma, California. It was founded within the Roman Catholic Diocese of Santa Rosa.

B.R. Cohn Winery is a winery in Sonoma Valley, California in the United States.

Carriger Creek is a stream Sonoma County, California. Southwest of the city of Sonoma, California, its name changes to Fowler Creek. This article covers both parts of the creek.

Graham Creek is a 2.9-mile-long (4.7 km) perennial stream in Sonoma County, California, tributary to Sonoma Creek. Graham Creek rises in the northern Sonoma Mountains and flows generally northeasterly down the northeastern flank of Sonoma Mountain. Historically this watercourse was called Wild Water Creek, a name used in the time of author Jack London, some of whose work was inspired by the stream. Steelhead, Oncorhynchus mykiss, have historically entered Graham Creek via Sonoma Creek for spawning. Stream surveys conducted from 1966 to 1986 indicated significant, but declining populations of anadromous fish. The spawning habitat of Graham Creek is considered medium to high value, with both winter and summer sheltering characteristics.

Hacienda Wine Cellars is a former winery once owned by Frank Bartholomew, that was located in Sonoma, California, United States. Hacienda was founded in 1973 after Bartholomew sold his ownership of Buena Vista Winery in 1968. After the sale, he retained the majority of his original vineyard land, and proceeded to acquire a former hospital located near the vineyard land and developed it into a winery. By 1977, it was operated by A. Crawford Cooley, producing 25,000 cases a year. JFJ Bronco purchased Hacienda by 1992, as well as Hacienda's sister label, Antares.

Kenwood Depot was a railway station in Kenwood, California. It opened in 1887 as South Los Guilicos, and shares some features with the San Carlos station on the San Francisco Peninsula which was built around the same time. The station building was the only stone depot constructed for the Santa Rosa and Carquinez Railroad and cost $11,500 (equivalent to $402,457 in 2024) — tracks were on the east side. The station's name was changed to Kenwood in 1895 with the rest of the town. Rail service continued until 1936, and the rail line was removed in 1942. In 1940, Southern Pacific sold the depot to the Kenwood Improvement Club for $500 (equivalent to $11,222 in 2024) and it was converted into a community center. It was designated a Sonoma County Historic Landmark in 1980.

The Nicholas Carriger Estate (16-acre) is a collection of buildings located in Sonoma, California, United States. The estate consists of three buildings: the main house built in 1847, a small house, which is a replica of the main house, built in 1860, and a winery, built in 1875. The main house and the Little Carriger house fall in the architectural Greek revival style. There also is a locally quarried "candy rock" stone small building next to the main house that may have been used as an ice house. The everflowing Yulupa Spring, which supplied water to the houses and is still flowing, is a short walk along a hillside pathway from the main house. In 1979 the estate was designated a Sonoma County Historic Landmark, and in 2001, it was added to the National Register of Historic Places.

Rancho Agua Caliente was a 3,219-acre (13.03 km²) Mexican land grant in present day Sonoma County, California given in 1840 by Governor Juan Alvarado to Lázaro Piña (often misspelled as "Pena" in historical documents). The name means "warm water" and refers to the hot springs in the area. The grant extended two and one half leagues to the north of Sonoma and was one quarter league wide, and included present day Glen Ellen, Fetters Hot Springs, and Agua Caliente.

Sonoma Valley's Larson Family Winery is on Sonoma Creek in the Los Carneros AVA of Sonoma County.

Rancho Huichica was a 18,704-acre (75.69 km²) Mexican land grant in present day Napa County, California given in 1841 to Jacob P. Leese. Carneros Creek forms the northeast boundary of Rancho Huichica, and the grant contains the majority of the Carneros region in Napa Valley.

Rancho Los Guilicos was an 18,834-acre (76.22 km²) Mexican land grant in present-day Sonoma County, California given in 1837 by Governor Juan B. Alvarado to John (Juan) Wilson. The grant extended along Sonoma Creek, south of Santa Rosa from Santa Rosa Creek south to almost Glen Ellen, and encompassed present day Oakmont, Kenwood and Annadel State Park.

Sonoma International Film Festival (SIFF) is a 501 (c)(3) non-profit arts organization, founded in 1997, headquartered in Sonoma, California.

Sonoma Mountain Zen Center (or, Genjoji) is a Soto Zen practice center located on 80 acres (30 ha) in the mountainous region of Sonoma County in California—near Santa Rosa—carrying on the tradition and lineage of Shunryu Suzuki. Founded by Jakusho Kwong and his wife Laura Kwong in 1973, Kwong-roshi is the current guiding teacher of the Zen center. Offering residential training, Saturday Community and group retreats. Sonoma Mountain Zen Center also offers a practice regimen for members of the surrounding area and elsewhere who are not residents.

The Sonoma Mountains are a northwest–southeast trending mountain range of the Inner Coast Ranges in the California Coast Ranges System, located in Sonoma County, Northern California.

The Van Hoosear Wildflower Preserve is a private nature reserve on Carriger Creek in southern Sonoma County, California, United States. Van Hoosear was created to preserve an area known for displays of native wildflowers and to allow animal migration and ecological connection between Sonoma Mountain and the floor of the Sonoma Valley. This 163-acre (66 ha) preserve has been established with an endowment fund to allow perpetual management; access to the preserve is controlled by the Sonoma Ecology Center.

Wolf House was a 26-room mansion in Glen Ellen, California, built by novelist Jack London and his wife Charmian London. The house burned on August 22, 1913, shortly before the Londons were planning to move in. Stone ruins of the never-occupied home still stand, and are part of Jack London State Historic Park, which has been a National Historic Landmark since 1963.

Yulupa Creek is a 2.8-mile-long (4.5 km) southeast-flowing perennial stream that rises on the southeastern flanks of the northern Sonoma Mountains in Sonoma County, California, United States. This creek, which drains the eastern slopes of Bennett Mountain, is a tributary to Sonoma Creek, which in turn discharges to San Pablo Bay. Yulupa Avenue in Santa Rosa is presumably named after this creek.

Sonoma Grammar School is a historic building located in Sonoma, California. Founded in 1916, it stands as the largest brick building in Sonoma. In 1952, the building was saved from demolition and is now the home of the Sonoma Community Center. The Sonoma Grammar School was added to the National Register of Historic Places on November 28, 1980.

The John Medica Gardens are a collection of folk art stoneworks and gardens created by John Medica in Santa Rosa, California in the United States. The gardens are on the list of California Historical Landmarks. The garden is located on a private property. It took Medica 20 years to create the gardens.

Passaggio Wines is a winery based in Sonoma, California in the United States.

Kenwood Vineyards is a winery in Kenwood, California, located on Highway 12 in the Sonoma Valley wine country. It is currently owned by Pernod Ricard Winemakers.

Italian Swiss Colony was a 19th and 20th-century American wine company and brand. Based in Asti, Sonoma County, California, Italian Swiss Colony was at one time the leading wine producer in California.

Cafe La Haye is a restaurant in Sonoma, California in the United States. It was opened by owner Saul Gropman in 1996. When Michael Bauer was food critic of the San Francisco Chronicle, Cafe La Haye was a perennial listing in his annual Top 100 restaurants list and one of his favorite restaurants in Wine Country. Cafe La Haye sources food produced within 60 miles of the restaurant.

Naval Outlying Landing Field Cotati was a naval airfield located near Cotati, in Sonoma County, California, US. It maintained active naval flight operations during the period 1941–1945.

Roseland is a neighborhood in Santa Rosa, California. As of the 2010 census, the population was 6,325. Roseland was an unincorporated enclave within the City of Santa Rosa until the area was annexed by Santa Rosa on November 1, 2017.

Occidental is a census-designated place (CDP) in Sonoma County, California, United States. The population was 1,132 at the 2020 census, up from 1,115 at the 2010 census.

Graton is an unincorporated town and census-designated place (CDP) in west Sonoma County, California, United States. The population was 1,707 at the 2010 census. Graton's ZIP code is 95444. The town also has a culinary reputation attributed to two restaurants in the area.

Running Fence was an installation art piece by Christo and Jeanne-Claude, which was completed in California on September 10, 1976. The art installation was first conceived in 1972, but the actual project took more than four years to plan and build. After it was installed, the builders removed it 14 days later, leaving no visible trace behind.

Naval Auxiliary Landing Field (NALF) Santa Rosa, California, also known as Naval Auxiliary Air Station, Santa Rosa, was a military airport located in Santa Rosa, California, in Sonoma County, California, USA.

The Press Democrat, with the largest circulation in California's North Bay, is a daily newspaper published in Santa Rosa, California.

Marimar Estate is a Californian winery located in Sonoma County, owned by Marimar Torres, the sister of Miguel A. Torres, President of Bodegas Torres.

Bloomfield is a census-designated place in Sonoma County, California, U.S. It is located in a rural area about 11 miles (18 km) southwest of Santa Rosa at the junction of Bloomfield Road and Valley Ford Road. Americano Creek flows westward along the south edge of the town.

Doyle Community Park is an urban park on the eastern edge of downtown Santa Rosa, California. The western end of the park is the confluence of Matanzas Creek and Spring Creek. Spring Creek forms the northern park boundary and Matanzas Creek forms the southern park boundary. The eastern end of the park is a fenced and lighted baseball field formerly used by the minor league Santa Rosa Pirates. The remainder of the park includes the Doyle Park Clubhouse, restrooms, playground slides and swings, horseshoe pits, separate fenced areas for unleashed large and small dogs, and picnic tables with barbecue grills including five sites available for reservation.

The Grove of Old Trees is a 48-acre (19 ha) open space reserve forest of mostly second growth coast redwood trees on a broad, flat ridgetop west of Occidental, California.

The Cotati Speedway was a 1.25-mile (2.01 km) wooden board track for automobile racing in Cotati, California. The track was built and opened in 1921, and featured heavily banked turns, which were around 41.5° at their steepest. It hosted six AAA Championship Car races across 1921 and 1922. Despite the popularity of the sport, the Cotati Speedway failed to attract the size of crowds the organisers had hoped for, partly due to the track's location. In December 1922, primarily for financial reasons, the track was shut down. Despite attempts by some locals to save the track, it was dismantled the following year, with much of the timber reclaimed and sold for other projects.

Summerfield Waldorf School & Farm is an independent Preschool–Grade 12 private school in Santa Rosa, California. It serves approximately 300 students, around 30% of whom receive tuition assistance. Summerfield is accredited by AWSNA Association of Waldorf Schools North America and Western Association of Schools and Colleges.

The Hinds Hotel (also known as the Freestone House, Freestone Hotel, Park House, and Wayside Inn) is a historic building located in Freestone, California in the United States. Built in 1876, the Hinds Hotel is a former hotel, antique store and plant nursery. Today, it serves as a private commercial business and home. It is listed on the National Register of Historic Places and has been named a California Historic Landmark and a Sonoma County Historic Landmark.

The Occidental Arts & Ecology Center (OAEC) is a non-profit organization and intentional community located near the town of Occidental in the western part of Sonoma County, California, the traditional homeland of the Southern Pomo and Coast Miwok. It is situated on an 80-acre ecological reserve in the Dutch Bill Creek Watershed, near the Russian River. OAEC is a research, demonstration, education, advocacy, and community-organizing center that develops strategies for regional-scale community resilience.

Riccas Corner is a census-designated place (CDP) in Sonoma County, California. The population is 38,986.

The Cotati Jazz Festival is an annual music festival held in Cotati, California, United States, since 1981. It typically takes place mid-June. Since 2006, admission has been free.

The Cotati-Rohnert Park Unified School District (CRPUSD) is a school district in Sonoma County, California.

Credo High School is a tuition-free, college prep public charter school in Rohnert Park, California, following the core principles of public Waldorf education and serving students in ninth through twelfth grades. The school has been expanding annually since it opened in 2011, and there are 400 students for the 2018-2019 school year. Credo High School was granted charter approval in 2010 after three years of planning by a development team led by Executive Director Chip Romer and Education Director Thomas Schaefer. The school was originally located on Southwest Blvd. in Rohnert Park, California, but in 2017 relocated to SOMO Village in Rohnert Park, planned to be the model sustainable community in North America and dedicated to reducing carbon dioxide emissions and creating a more sustainable world. Today, Credo High School is the only "One Planet" school in the world and has been recognized as a Planetary Leader by Bioregional, Inc., the London-based international nonprofit that oversees One Planet Living worldwide. The school is financially supported by Awakening Entelechy, Inc., a nonprofit created expressly for the purpose of supporting the school.

El Camino High School is an alternative education high school located in Rohnert Park, California in the United States.

Five Creek is a westward flowing stream that rises in the city of Rohnert Park, California, United States and discharges to the Laguna de Santa Rosa. The creek is channelized as it flows through the city and runs in an artificially rectilinear fashion. Considered waters of the United States as a jurisdictional matter, Five Creek has potential habitat for the California red-legged frog and the Western pond turtle.

Freeman Vineyard & Winery is a California winery based in the Southern Russian River Valley AVA just outside Sebastopol in Sonoma County. The winery was founded in 2001 by Ken and Akiko Freeman. They are recognized for producing cool-climate Pinot noir and Chardonnay in a Burgundian style.

KJZY (93.7 MHz, "Jazzy 93.7") is an FM radio station in licensed to Sebastopol, California. It broadcasts to the Sonoma Valley. Owned by Redwood Empire Stereocasters, it broadcasts an adult standards format.

KRCB-FM (104.9 FM) is a radio station in Rohnert Park, California, and broadcasting to the Santa Rosa-Sonoma County area. The station became the primary radio frequency for Northern California Public Media's public radio service in 2021 after operating as a commercial station since 1986. As a public radio station, KRCB-FM features NPR and local news and talk programs, along with music programs featuring adult album alternative, jazz, blues, and world music.

KRRS (1460 AM) is a radio station broadcasting a Regional Mexican format. Licensed to Santa Rosa, California, United States, it serves the Santa Rosa area. The station is currently owned by Abel De Luna, through licensee Luna Foods, Inc.

KSRO (1350 AM) is a commercial radio station broadcasting a news/talk radio format. KSRO is licensed to Santa Rosa, California, and serves the Sonoma County area. The station is owned by Lawrence Amaturo, through licensee Amaturo Sonoma Media Group, LLC.

KZST (100.1 FM) is a commercial radio station licensed to Santa Rosa, California, and serving Sonoma County. It is owned by Lawrence V. Amaturo, through licensee Amaturo Sonoma Media Group, LLC, and broadcasts an adult contemporary radio format, switching to Christmas music for much of November and December. Evenings, it carries the nationally syndicated Delilah call in and request show. KZST's radio studios and offices are on Mendocino Avenue in Santa Rosa.

Kistler Vineyards is a family-owned California winery located in Northern California's wine producing region of Sonoma County. According to Food and Wine Magazine, their "biannual release of Chardonnay is one of the most sought after by wine enthusiasts" and Food and Wine Magazine's Wine Guide considers their Chardonnays the "Best of the Best" among "Star Producers"

Lichau Creek is an 8.9-mile-long (14.3 km) southwest-flowing stream in Sonoma County, California, United States, which flows through the town of Penngrove and discharges into the Petaluma River.

The Petaluma and Santa Rosa Railway Power House is a historic building in Sebastopol, California, U.S., built to serve the Petaluma and Santa Rosa Railroad, an electric interurban railway of Sonoma County. It is also known as the Hogan Building and the P&SR Substation. It was listed on the National Register of Historic Places in 1991.

Rancho Blucher was a 26,759-acre (108.29 km²) Mexican land grant in present day Marin and Sonoma County, California given in 1844 by Governor Manuel Micheltorena to Jean Jacques Vioget. The rancho is named for the Prussian field marshal Gebhard Leberecht von Blücher. The grant extended along the coast from Estero Americano on the north and to Estero de San Antonio on the south.

Rancho Cañada de Jonive was a 10,787-acre (43.65 km²) Mexican land grant in present day Sonoma County, California given in 1845 by Governor Pío Pico to James Black. The grant encompassed the town of Freestone.

Rancho Cañada de Pogolimi (also called "Cañada de Pogolome" and "Cañada de Pogolomi") was a 8,781.81-acre (35.5387 km²) Mexican land grant in present-day Sonoma County, California given in 1844 by Governor Manuel Micheltorena to María Antonia Cazares, widow of James Dawson. The grant encompasses present-day Bloomfield.

Rancho Cabeza de Santa Rosa was an 8,885-acre (35.96 km²) Mexican land grant in present-day Sonoma County, California given in 1841 by Governor pro tem Manuel Jimeno to María Ygnacia López. The grant was along Santa Rosa Creek, and encompassed present-day Santa Rosa, California.

Rancho Estero Americano was a 8,849-acre (35.81 km²) Mexican land grant in present-day Sonoma County, California given in 1839 by Governor Pro-tem Manuel Jimeno to Edward Manuel McIntosh. The rancho takes its name from Estero Americano.

Rancho Llano de Santa Rosa was a 13,316-acre (53.89 km²) Mexican land grant in present-day Sonoma County, California given in 1844 by Governor Manuel Micheltorena to Joaquín Carrillo. The name means "Plains of Santa Rosa". The grant was west of Santa Rosa along the Laguna de Santa Rosa and encompassed present-day Sebastopol, California.

Rancho Roblar de la Miseria was a 16,887-acre (68.34 km²) Mexican land grant in present-day Sonoma County, California given in 1845 by Governor Pío Pico to Juan Nepomuceno Padilla. "El Roblar de la Miseria" means "The Oak of the Misery". The grant extended along the Petaluma River from Hessel, Roblar, Liberty and Two Rock south to Petaluma.

Roseland University Prep is a public college preparatory high school located in Santa Rosa, California, United States. It is a part of the Roseland Public Schools school district. The school serves the Roseland neighborhood and greater Southwest Santa Rosa.

Rosenberg's Department Store is located at Fourth and D Streets in downtown Santa Rosa, California. The structure is the most significant example of the Streamline Moderne style in Santa Rosa, and was the tallest building in the city for many years.

The Gurdwara Sahib of Santa Rosa (also commonly referred to as the Santa Rosa Gurdwara, the Sikh Temple of Santa Rosa, or the North Bay Sikh Foundation) is a center of Sikh worship.

South Park is residential neighborhood in the city of Santa Rosa, California. It is located in south Santa Rosa, east of U.S. Highway 101, south of Bennett Valley Road, west of the Sonoma County Fairgrounds, and encompasses 60 blocks. The community is known for its old houses and artistic murals in the area, and notorious for its history of an above average crime rate and gang activity. South Park was also once a settlement for African Americans during the mid-1900s and was a center of Santa Rosa's Black community. Today, the neighborhood is mainly Latino. It has around 1,500 residents.

Washoe Creek is a perennial stream located in Sonoma County, California. It is about 2 mi (3 km) long and discharges to the Laguna de Santa Rosa.

Watson School is a Sonoma County Regional Parks Department historic park, covering approximately 0.75 acres (0.30 ha), located about 2 miles (3.2 km) east of Bodega, California, on the south side of the road, at 15000 Bodega Highway in Sonoma County, California, United States. It was listed on the National Register of Historic Places in 1978.

The Graton Rancheria was a 15.45-acre (62,500 m²) property in the coastal hills of northern California, about two miles (3 km) northwest of Sebastopol. The site is about 1.5 miles (2.4 km) southwest of the hamlet of Graton, population 1,815 in 2000. The area is a few miles west of Santa Rosa, the largest of Sonoma County's nine cities and the County seat, population 147,595 in 2000. It was a former rancheria for Central Coast and Central valley tribes, including the Southern Pomo, a Hokan-speaking tribe, and Coast Miwok.

Rohnert Park Stadium was a stadium in Rohnert Park, California. It was primarily used for baseball and was the home field of the Redwood Pioneers and the Sonoma County Crushers minor league baseball teams. It was also a soccer field for the North Bay Breakers, a semi-pro soccer team.

The fatal killing of Andy Lopez by Sonoma County sheriff's deputy Erick Gelhaus took place on October 22, 2013, in Santa Rosa, California. 13-year-old Lopez was walking through a vacant lot and carrying an airsoft gun that was designed to resemble an AK-47 assault rifle. Gelhaus opened fire on Lopez, presumably mistaking the airsoft gun for a real firearm. The shooting prompted many protests in Santa Rosa, and throughout California.

Merry Edwards is a Californian winery, established in 1997. It is noted for its Pinot noirs in the Russian River Valley AVA of Sonoma County.

Morningstar Commune (also known as Morning Star Ranch and The Digger Farm) was an active open land counterculture commune in rural Sonoma County, California, located at 12542 Graton Road near Occidental.

The Sonoma County Fairgrounds is a fairground and exhibition center located in Santa Rosa, California. It is where the annual Sonoma County fair takes place and other events throughout the year.

California Carnivores is a plant nursery in Sebastopol, California in the United States. Specializing in the cultivation of carnivorous plants, CC is home to one of the largest collections of imported carnivorous plants in North America, and possibly the world, with more than 1,000 types of imported plant and dozen of varieties for sale in the retail section of the nursery.

The Santa Rosa Police Department is the police force for Santa Rosa, California. The department has 270 sworn and civilian employees.

The Ceres Community Project is a U.S. non-profit organization that mentors teens in nutrient-dense food preparation as well as chef, employment, and business skills, then works with volunteers to deliver the food to people with life-threatening illnesses and their families. Ceres also includes a garden to grow produce for the program. The organization has also partnered with other non-profit organizations such as the Work Horse Organic Agriculture (WHOA), which supplies organic produce and eggs to Ceres.

Sonoma Coast is an American Viticultural Area (AVA) in Sonoma County, California encompassing approximately 480,000 acres (750 sq mi), mostly along the coastline of the Pacific Ocean, but also includes inland areas extending from San Pablo Bay to the Mendocino County border. It was established by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury on June 10, 1987 after reviewing the petition submitted by Ms. Sara Schorske, a wine industry consultant residing in Santa Rosa, California, for a viticultural area in Sonoma County, to be known as "Sonoma Coast."
The appellation is known for its cool climate and high rainfall relative to other parts of Sonoma County. The area has such a broad range of microclimates that petitions were submitted to the Alcohol and Tobacco Tax and Trade Bureau (TTB), Treasury to establish the unique coastal viticultural areas of Fort Ross-Seaview , recognized in December 2011, and the West Sonoma Coast, more recently established in 2023.

State Route 116 (SR 116) is a state highway in the U.S. state of California in Sonoma County. The route runs from SR 1 on the Pacific coast near Jenner to SR 121 south of Sonoma.

The Jenner, California, double murder of 2004 occurred on the night of August 14–15, 2004, in which a young couple was shot to death as they slept on a state beach. The bodies of Lindsay Cutshall, 22, and her fiancé Jason S. Allen, 26, were found on Fish Head Beach, between Russian Gulch and the mouth of the Russian River, in the small coastal hamlet of Jenner, California. Both Cutshall and Allen were killed with a .45-caliber Marlin rifle as they slept in their sleeping bags on the beach. The Sonoma County Coroner's Office estimated that the couple was slain on either the night of August 14, 2004 or in the early morning hours of August 15, 2004.

The Bodega Bay Nuclear Power Plant was a proposed Northern California nuclear power facility that was stopped by local activism in the 1960s and never built. The foundations, located 2 miles (3.2 km) west of the active San Andreas Fault, were being dug at the time the plant was cancelled. The action has been termed "the birth of the anti-nuclear movement."

Sereno del Mar (Spanish for "Serene of the Sea") is a census-designated place (CDP) in Sonoma County, California. Sereno del Mar sits at an elevation of 190 feet (58 m). The 2020 United States census reported Sereno del Mar's population was 107.

Rancho Bodega was a 35,487-acre (143.61 km²) Mexican land grant in present-day Sonoma County, California, given in 1844 by Governor Manuel Micheltorena to Stephen Smith. Bodega takes its name from the Peruvian explorer Juan Francisco de la Bodega y Quadra who discovered Bodega Bay in 1775. The grant extended along the Pacific coast from the Russian River on the north to Estero Americano on the south, and included the present-day town of Bodega Bay. Only a small part of Bodega is within the grant (most of Bodega in on Rancho Estero Americano).

Sonoma Coast State Marine Conservation Area is a protected area along the coast of northern California, part of the North Central Coast Study Region.

Ocean Song is a ridge-top preserve overlooking the Pacific coast in western Sonoma County, California. The preserve encompasses approximately 800 acres (320 ha) of grasslands with mixed oak woodlands. Since acquiring the property in 2019, LandPaths has been cleaning up old buildings and restoring the environment for native species. LandPaths intends to restore Ocean Song's use for nature-based education, but the preserve was not open to public access by 2023.

State Route 121 (SR 121) is a state highway in the U.S. state of California. It runs through the Wine Country region of Sonoma and Napa counties. Its southern terminus is at State Route 37 at Sears Point, and its northern terminus is at State Route 128 near Lake Berryessa. SR 121 passes through the Carneros region of the southern Sonoma Valley and Napa Valley.

Los Carneros (also known as Carneros) is an American Viticultural Area (AVA) which includes parts of both Sonoma and Napa counties in California, U.S.A. The 37,000 acres (58 sq mi) area was recognized on September 18, 1983 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by Beaulieu Vineyards proposing to establish a viticultural area named "Los Carneros.” The proximity to the cool fog and breezes from San Pablo Bay to the south makes the climate in Los Carneros cooler and more moderate than wine regions farther north in Napa and Sonoma Valleys. The cooler climate has made Los Carneros attractive for the cultivation of cooler climate varietals like Pinot noir and Chardonnay. Many of the grapes grown in Los Carneros are used for sparkling wine production. Receiving its AVA status in 1983, the Carneros area was the first wine region in California to be defined by its climate characteristics rather than political boundaries.

Adobe Creek is a southward-flowing stream in Sonoma County, California, United States, which flows past the historic Rancho Petaluma Adobe on the creek's 7.5-mile (12.1 km) course to its confluence with the Petaluma River. It has also been called Casa Grande Creek.

Arroyo Seco is a 6.9-mile-long (11.1 km) tributary stream to Schell Creek in southern Sonoma County, California, United States. In Spanish arroyo seco means "dry stream." Arroyo Seco Creek drains a portion of the western slopes of the southern Mayacamas Mountains. Its 11.4-square-mile (30 km²) watershed, along with the entire Mayacamas mountain block, was formed in the Miocene era by volcanic action and with tectonic uplift about 12 million years ago.

Gloria Ferrer Caves & Vineyards is a winery in Sonoma County, California that specializes in sparkling wines, as well as Pinot noir and Chardonnay wine. It was the first sparkling wine producer in Carneros. It was also the first to plant Champagne grape clones in the region.

KDYA (1190 kHz), "Gospel 1190 The Light", is a commercial AM radio station owned by Salem Media Group and licensed to Vallejo, California, serving the San Francisco Bay Area. It broadcasts an urban gospel radio format, and is Northern California's only full-time urban gospel station reaching San Francisco, Sacramento, Santa Rosa and Stockton.

KZNB (1490 AM) is a radio station that broadcasts a Regional Mexican format. Licensed to Petaluma, California, it serves the Santa Rosa area. The station is owned by Abel De Luna, through licensee Luna Foods, Inc.

Lynch Creek is a 7.1-mile-long (11.4 km) stream in Sonoma County, California, United States which discharges into the Petaluma River.

The Old Petaluma Opera House (also known as the Maclay Building) is a historic building located in downtown Petaluma, California.

Petaluma Wildlife & Natural Science Museum is a student-run museum located in the city of Petaluma, California. It is the largest student-run museum in the United States. Its mission is "to inspire the next generation through practical environmental education and conservation." It is a 501(c)3 non-profit organization, relying on donations to fund expenses. The museum is located on the Petaluma High School campus, in which a "Wildlife Management" and a "Museum Management" class can be taken as an elective.

Rancho Petaluma was a 66,622-acre (269.61 km²) Mexican land grant in present-day Sonoma County, California given in 1834 by Governor José Figueroa to Mariano Guadalupe Vallejo. Rancho Petaluma stretched from Petaluma River on the west over the hills and down to Sonoma Creek on the east, including all land that lay between these two waterways from the edge of San Francisco Bay to approximately the present site of Glen Ellen. The rancho included present-day Petaluma and Lakeville.

Rancho Suscol was an 84,000-acre (340 km²) Mexican land grant in present day Sonoma County, California, Napa County, California, and Solano County, California, given in 1843 by Governor Manuel Micheltorena to General Mariano Guadalupe Vallejo. In a significant land law decision, the land claim was rejected by the US Supreme Court in 1862. Rancho Suscol extended from Rancho Petaluma on the west, south down to the San Francisco Bay and Mare Island and Carquinez Strait, and then to Rancho Suisun on the east. It included present day cities of Vallejo and Benicia.

Sears Point is a prominent landform that juts into the San Pablo Bay in Sonoma County, California, United States. This hill is the southernmost peak of the Sonoma Mountains and forms the southwestern ridge above Tolay Lake. Starting with European settlement of this area in the mid-19th century considerable modification of the Napa Sonoma Marsh began to occur, such that in contemporary times, there is considerable upland between Sears Point and San Pablo Bay. Numerous local conservation organizations are presently working to restore hundreds of acres of these historic tidal wetlands as part of the Sears Point Wetlands and Watershed Restoration Project. The region can be accessed via State Route 37 or State Route 121.

Shollenberger Park is a 165-acre (0.67 km²) wetland park located in Petaluma, California. Together with the 80-acre (320,000 m²) Alman Marsh, and 260-acre (1.1 km²) Ellis Creek which opened to the public in July 2009, a total of 505 acres (2.04 km²) are accessible to the public. The entirety is referred to as the "Petaluma Wetlands".

Skaggs Island Naval Communication Station is a former United States Navy installation located near California State Route 37 between Novato and Vallejo, California. It was a secretive, secure, and self-contained naval base, engaged in a number of communications and intelligence gathering functions for the Navy and other federal intelligence organizations. The 3,310-acre (13.4 km²) site was purchased by the Navy in 1941, and closed in 1993. The antennas continued to be used for some time after that, but by 2013 they were removed along with all of the remaining buildings.

Sonoma Mountain High School is one of three alternative schools in Petaluma, California. It is located on the Casa Grande High School campus. There are, on average, 32 pupils enrolled at Sonoma Mountain High School at any given time. About 6 pupils graduate every year.

St. Vincent de Paul High School is a private, Roman Catholic high school in Petaluma, California. It is located in the Roman Catholic Diocese of Santa Rosa in California.

Telecom Valley was an area located in Sonoma County, California specifically the Redwood Business Park of Petaluma, California.

Terra de Promissio (English: The Land of Promise) is a family owned and operated vineyard that grows Sonoma Coast pinot noir grapes. The vineyard is located in the Sonoma Coast AVA, outside Petaluma, California in Sonoma County.

The NHRA Sonoma Nationals is a drag racing event in the NHRA Mission Foods Drag Racing Series, that has been held annually at Sonoma Raceway in Sonoma, California since 1988.

On October 25, 1991, a Bell 206 carrying rock music concert promoter Bill Graham, his girlfriend Melissa Gold, and pilot Steve Kahn crashed into a transmission tower west of Vallejo, California, killing everyone on board. The cause of the accident was determined to be the pilot's intentional flight into known adverse weather conditions.

The 1898 Mare Island earthquake occurred in Northern California on March 30 at 23:43 local time with a moment magnitude of 5.8–6.4 and a maximum Mercalli intensity of VIII–IX (Severe–Violent). Its area of perceptibility included much of northern and central California and western Nevada. Damage amounted to $350,000 (about $10,700,000 inflation adjusted to 2018) and was most pronounced on Mare Island, a peninsula in northern San Francisco Bay. While relatively strong effects there were attributed to vulnerable buildings, moderate effects elsewhere in the San Francisco Bay Area consisted of damaged or partially collapsed structures, and there were media reports of a small tsunami and mostly mild aftershocks that followed.

Washington Creek is a southward-flowing stream in Sonoma County, California, United States which enters the city of Petaluma and discharges to the Petaluma River.

The Petaluma Historic Commercial District is a 17.4 acres (7.0 ha) historic district in Petaluma, California which was listed on the National Register of Historic Places in 1995. It is located along Petaluma Boulevard, between B St. and Prospect St.

The Philip Sweed House, in Petaluma, California, is a Queen Anne-style house built in 1892. It has sometimes, mistakenly, been reported as the "Philip Swede House."

Mystic Theatre, also known as McNear's Mystic Theatre, is a historic building and music venue built in 1911, and located in Petaluma, California. The McNear's Saloon and Dining House is housed next door in an adjoined building.