60456 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":41.731248,"wof:name":"60456","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102084317,"localadmin_id":404497667,"locality_id":85940819,"postalcode_id":554783299,"region_id":85688697}],"mz:is_deprecated":0,"lbl:latitude":41.731248,"mz:postal_locality_alt":["Oak Lawn"],"geom:area":1.34E-4,"geom:longitude":-87.731134,"wof:id":554783299,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611183903,"wof:belongsto":[102191575,85633793,102084317,404497667,85940819,85688697],"wof:concordances":{"gp:id":"12784164"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588093","geom:area_square_m":1238612.047675,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-87.741208,41.727419,-87.721435,41.734862","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-87.731134,"wof:geomhash":"2aeb819b15f6537da24eea1773526027","wof:parent_id":85940819,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Hometown"}