60913 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":41.146995,"wof:name":"60913","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102081259,"localadmin_id":404496557,"locality_id":85939997,"postalcode_id":554733525,"region_id":85688697}],"mz:is_deprecated":0,"lbl:latitude":41.146985,"mz:postal_locality_alt":["Herscher"],"geom:area":0.012743,"geom:longitude":-88.06178,"wof:id":554733525,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184248,"wof:belongsto":[102191575,85633793,102081259,404496557,85939997,85688697],"wof:concordances":{"gp:id":"12784351"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588123","geom:area_square_m":1.18657138765733E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-88.145508,41.072437,-87.975624,41.205604","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-88.061778,"wof:geomhash":"b34c96c1c9f1aff30340cd17ed9083b0","wof:parent_id":85939997,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Bonfield"}