OSM tag name=Harford Furnace Historic District matches Harford Furnace Historic District in these Wikidata fields:
| Historic districts in Harford County, Maryland | admin_level, boundary=protected_area, landuse=residential, leisure=park, boundary=administrative, place |
| Historic districts on the National Register of Historic Places in Maryland | admin_level, boundary=protected_area, landuse=residential, leisure=park, boundary=administrative, historic, place |
| Industrial buildings and structures on the National Register of Historic Places in Maryland | man_made=works, boundary=protected_area, building=manufacture, historic, building=industrial |
| National Register of Historic Places in Harford County, Maryland | historic, boundary=protected_area |