Greenfield is a locality and its consensus geometry is derived from whosonfirst.
{"wof:statistical_gore":1,"mz:is_ceased":0,"geom:latitude":42.940486,"wof:coterminous":[404477177],"wof:name":"Greenfield","counts:names_total":1,"wof:placetype":"locality","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102085493,"localadmin_id":404477177,"locality_id":1729468389,"region_id":85688689}],"mz:is_deprecated":0,"mz:min_zoom":30,"lbl:latitude":42.932548,"geom:area":0.007643,"geom:longitude":-71.870751,"wof:id":1729468389,"geom:type":"Polygon","wof:lastmodified":1613764636,"wof:belongsto":[102191575,85633793,102085493,404477177,85688689],"mps:latitude":42.932548,"wof:repo":"whosonfirst-data-admin-us","src:geom":"whosonfirst","wof:country":"US","counts:names_preferred":1,"geom:area_square_m":6.9185896188165E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","src:geom_via":"uscensus","counts:names_languages":1,"geom:bbox":"-71.948083,42.878657,-71.802556,42.988","name:eng_x_preferred":["Greenfield"],"mps:longitude":-71.859805,"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-71.859805,"wof:geomhash":"185a48ec171c1cd745acfe32bb406428","wof:parent_id":404477177,"wof:placetype_names":["locality"],"mz:hierarchy_label":1,"wof:placetype_id":102312317,"edtf:cessation":"uuuu"}