18049 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":40.517407,"wof:name":"18049","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102081327,"localadmin_id":404486083,"postalcode_id":554705587,"region_id":85688481}],"mz:is_deprecated":0,"lbl:latitude":40.515732,"geom:area":0.004143,"geom:longitude":-75.500782,"wof:id":554705587,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1611184110,"wof:belongsto":[102191575,85633793,102081327,404486083,85688481],"wof:concordances":{"gp:id":"12765041"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"geom:area_square_m":3.8946417493949E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-75.554904,40.484888,-75.445995,40.556541","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-75.48929,"wof:geomhash":"c57e20ab8b15e5ab173e6a8a84007b84","wof:parent_id":404486083,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Emmaus"}