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 | admin_level, boundary=administrative, leisure=park, historic, place, boundary=protected_area, landuse=residential |
| Market houses | building=country_house, historic=manor |
| Neighborhoods in Baltimore | place=neighbourhood, landuse=residential |
| Urban public parks | leisure=common, landuse=recreation_ground, leisure=park, boundary=national_park |