Southfield is a locality and its consensus geometry is derived from whosonfirst.
{"wof:statistical_gore":1,"mz:is_ceased":0,"geom:latitude":42.522159,"wof:name":"Southfield","counts:names_total":1,"wof:placetype":"locality","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102083713,"localadmin_id":404508307,"locality_id":1729437065,"region_id":85688599}],"mz:is_deprecated":0,"mz:min_zoom":30,"lbl:latitude":42.521586,"geom:area":4.4E-5,"geom:longitude":-83.228414,"wof:id":1729437065,"geom:type":"MultiPolygon","wof:lastmodified":1613765562,"wof:belongsto":[102191575,85633793,102083713,404508307,85688599],"mps:latitude":42.521586,"wof:repo":"whosonfirst-data-admin-us","src:geom":"whosonfirst","wof:country":"US","counts:names_preferred":1,"geom:area_square_m":397058.206858,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","src:geom_via":"uscensus","counts:names_languages":1,"geom:bbox":"-83.320895,42.517188,-83.215524,42.529444","name:eng_x_preferred":["Southfield"],"mps:longitude":-83.220947,"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-83.220947,"wof:geomhash":"1f83aac926777ca7c2b8168419a05863","wof:parent_id":404508307,"wof:placetype_names":["locality"],"mz:hierarchy_label":1,"wof:placetype_id":102312317,"edtf:cessation":"uuuu"}