Warren

Michigan's 9th congressional district used to be contained within Oakland County in the southeast areas of the state of Michigan and encompassed most of the county. The district area has changed significantly in the 2012 redistricting, now south and east of the previous district borders. The district now includes the communities of Warren, Bloomfield and Sterling Heights.

Detroit Arsenal (DTA), formerly Detroit Arsenal Tank Plant (DATP) was the first manufacturing plant ever built for the mass production of tanks in the United States. Established in 1940 under Chrysler, the plant was owned by the U.S. government until 1996. It was designed by architect Albert Kahn. The building was designed originally as a "dual production facility, so that it could make armaments and be turned into peaceful production at war's end. Notwithstanding its name, the 113-acre (0.46 km²) site was located in Warren, Michigan, Detroit's most populous suburb.

Warren Transmission is a General Motors transmission factory in Warren, Michigan. It is located at 23500 Mound Rd. and opened in 1941 as a Navy ordnance plant, built and operated by the Hudson Motor Car Co. As of 2006, the factory employed 1,200 people. The company announced on June 1, 2006 that it would spend $332 million to expand production at Warren. On April 5, 2010 GM announced it was adding 100 jobs to the Warren Transmission plant.

The GM Technical Center is a General Motors facility in Warren, Michigan. The campus has been the center of the company's engineering effort since its inauguration in 1956. In 2000 it was listed on the National Register of Historic Places; fourteen years later it was designated a National Historic Landmark, primarily for its architecture.

WPHS (89.1) is a radio station owned and operated by Warren Consolidated Schools, in Warren, Michigan, United States. WPHS was originally located at 91.5 FM with 10 watts; WPHS now operates at 100 watts at 89.1 FM. The radio station's first broadcast was on March 24, 1964.