OSM tag name=Hillhouse Avenue Historic District matches Hillhouse Avenue Historic District in these Wikidata fields:
| Historic districts in New Haven, Connecticut | place, admin_level, leisure=park, boundary=protected_area, boundary=administrative, landuse=residential |
| Historic districts on the National Register of Historic Places in Connecticut | place, admin_level, leisure=park, historic, boundary=protected_area, boundary=administrative, landuse=residential |
| Houses in New Haven County, Connecticut | historic=manor, building=country_house |
| National Register of Historic Places in New Haven, Connecticut | boundary=protected_area, historic |
| Tourist attractions in New Haven County, Connecticut | tourism=museum, tourism=attraction |
| Yale University | building=university, site=university, amenity=university, type=site |