Concord is a locality and its consensus geometry is derived from whosonfirst.
{"wof:statistical_gore":1,"mz:is_ceased":0,"geom:latitude":38.552809,"wof:name":"Concord","counts:names_total":1,"wof:placetype":"locality","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102086173,"localadmin_id":404515927,"locality_id":1729446841,"region_id":85688661}],"mz:is_deprecated":0,"mz:min_zoom":30,"lbl:latitude":38.552301,"geom:area":2.48E-4,"geom:longitude":-90.299462,"wof:id":1729446841,"geom:type":"Polygon","wof:lastmodified":1613765480,"wof:belongsto":[102191575,85633793,102086173,404515927,85688661],"mps:latitude":38.552301,"wof:repo":"whosonfirst-data-admin-us","src:geom":"whosonfirst","wof:country":"US","counts:names_preferred":1,"geom:area_square_m":2396024.115474,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","src:geom_via":"uscensus","counts:names_languages":1,"geom:bbox":"-90.311171,38.542648,-90.287051,38.562368","name:eng_x_preferred":["Concord"],"mps:longitude":-90.29965,"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-90.29965,"wof:geomhash":"ec146073120e6878f23a1f337aa1dfd1","wof:parent_id":404515927,"wof:placetype_names":["locality"],"mz:hierarchy_label":1,"wof:placetype_id":102312317,"edtf:cessation":"uuuu"}