53115 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":42.655411,"wof:name":"53115","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102081883,"localadmin_id":404494693,"postalcode_id":554727597,"region_id":85688517}],"mz:is_deprecated":0,"lbl:latitude":42.656603,"mz:postal_locality_alt":["Walworth"],"geom:area":0.021263,"geom:longitude":-88.673092,"wof:id":554727597,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611185516,"wof:belongsto":[102191575,85633793,102081883,404494693,85688517],"wof:concordances":{"gp:id":"12780842"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12590598","geom:area_square_m":1.9336041408014E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-88.77801,42.55535,-88.540804,42.752093","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-88.668294,"wof:geomhash":"3233a265ff183b98bd8e36f255c50559","wof:parent_id":404494693,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Delavan"}