56091 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":43.927335,"wof:name":"56091","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102087641,"localadmin_id":404510941,"postalcode_id":554729869,"region_id":85688727}],"mz:is_deprecated":0,"lbl:latitude":43.927424,"geom:area":0.00569,"geom:longitude":-93.685698,"wof:id":554729869,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611185417,"wof:belongsto":[102191575,85633793,102087641,404510941,85688727],"wof:concordances":{"gp:id":"12782246"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588877","geom:area_square_m":5.0675310200251E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-93.737849,43.876914,-93.627126,43.982258","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-93.681297,"wof:geomhash":"291d4a3c4c6256022196f69c459c613b","wof:parent_id":404510941,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Waldorf"}