58641 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":46.668437,"wof:name":"58641","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102082105,"localadmin_id":404482187,"postalcode_id":554732207,"region_id":85688525}],"mz:is_deprecated":0,"lbl:latitude":46.667877,"geom:area":0.021486,"geom:longitude":-102.498594,"wof:id":554732207,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184398,"wof:belongsto":[102191575,85633793,102082105,404482187,85688525],"wof:concordances":{"gp:id":"12783427"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12589518","geom:area_square_m":1.82310630145133E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-102.664551,46.629584,-102.348047,46.732115","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-102.513912,"wof:geomhash":"9f3da035f67cd53cbce4aa86e0dc968b","wof:parent_id":404482187,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Lefor"}