OSM tag name=Union Square-Hollins Market Historic District matches Union Square-Hollins Market Historic District in these Wikidata fields:
| Historic districts on the National Register of Historic Places in Baltimore | boundary=protected_area, leisure=park, place, historic, landuse=residential, boundary=administrative, admin_level |
| Market houses | historic=manor, building=country_house |
| Neighborhoods in Baltimore | landuse=residential, place=neighbourhood |
| Urban public parks | landuse=recreation_ground, boundary=national_park, leisure=park, leisure=common |