50112 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":41.731336,"wof:name":"50112","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102086633,"locality_id":85943759,"postalcode_id":554725561,"region_id":85688713}],"mz:is_deprecated":0,"lbl:latitude":41.730188,"geom:area":0.051476,"geom:longitude":-92.714778,"wof:id":554725561,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611183255,"wof:belongsto":[102191575,85633793,102086633,85943759,85688713],"wof:concordances":{"gp:id":"12779760"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"2347574","geom:area_square_m":4.75010666747585E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-92.844066,41.581169,-92.590605,41.862384","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-92.715452,"wof:geomhash":"7f43bef261e9ae5a8ec1a4c4aa88eeae","wof:parent_id":85943759,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Grinnell"}