60426 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":41.610345,"wof:name":"60426","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102084317,"localadmin_id":404497591,"locality_id":85940833,"postalcode_id":554783281,"region_id":85688697}],"mz:is_deprecated":0,"lbl:latitude":41.610343,"mz:postal_locality_alt":["Phoenix","Dixmoor","Markham"],"geom:area":0.002156,"geom:longitude":-87.653397,"wof:id":554783281,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611183880,"wof:belongsto":[102191575,85633793,102084317,404497591,85940833,85688697],"wof:concordances":{"gp:id":"12784136"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588093","geom:area_square_m":1.9928549764877E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-87.698184,41.579063,-87.621523,41.639083","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-87.653395,"wof:geomhash":"5a1178a6ad8674919cc0f8099f2cb447","wof:parent_id":85940833,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Harvey"}