51038 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":42.705534,"wof:name":"51038","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102086519,"postalcode_id":554726399,"region_id":85688713}],"mz:is_deprecated":0,"lbl:latitude":42.703191,"geom:area":0.02569,"geom:longitude":-96.31436,"wof:id":554726399,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184867,"wof:belongsto":[102191575,85633793,102086519,85688713],"wof:concordances":{"gp:id":"12780216"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588346","geom:area_square_m":2.3342926433804E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-96.469043,42.633807,-96.173034,42.764416","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-96.316957,"wof:geomhash":"a7f10ecb774f73c5b6817e7bfe95e6f6","wof:parent_id":102086519,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Merrill"}