46321 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":41.546941,"wof:name":"46321","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102087149,"localadmin_id":404501869,"locality_id":85941831,"postalcode_id":554782427,"region_id":85688709}],"mz:is_deprecated":0,"lbl:latitude":41.54751,"mz:postal_locality_alt":["Dyer","Hammond"],"geom:area":0.002136,"geom:longitude":-87.50394,"wof:id":554782427,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611183625,"wof:belongsto":[102191575,85633793,102087149,404501869,85941831,85688709],"wof:concordances":{"gp:id":"12777717"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588225","geom:area_square_m":1.9764433729456E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-87.525586,41.522655,-87.480436,41.581533","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-87.503269,"wof:geomhash":"5af339c88d6bea396717e66874646839","wof:parent_id":85941831,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Munster"}