54656 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":44.002794,"wof:name":"54656","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102081777,"localadmin_id":404494411,"postalcode_id":554728539,"region_id":85688517}],"mz:is_deprecated":0,"lbl:latitude":43.990087,"mz:postal_locality_alt":["Fort Mccoy"],"geom:area":0.072787,"geom:longitude":-90.811011,"wof:id":554728539,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1611185073,"wof:belongsto":[102191575,85633793,102081777,404494411,85688517],"wof:concordances":{"gp:id":"12781458"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12590575","geom:area_square_m":6.47390288455766E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-90.978639,43.812677,-90.647446,44.159146","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-90.80319,"wof:geomhash":"b48755e73e1c2f5b3c166165f0fc74a7","wof:parent_id":404494411,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Sparta"}