18020 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":40.672291,"wof:name":"18020","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102081395,"localadmin_id":404485989,"postalcode_id":554705561,"region_id":85688481}],"mz:is_deprecated":0,"lbl:latitude":40.672385,"geom:area":0.003876,"geom:longitude":-75.326886,"wof:id":554705561,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184093,"wof:belongsto":[102191575,85633793,102081395,404485989,85688481],"wof:concordances":{"gp:id":"12765023"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"geom:area_square_m":3.6352895256254E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-75.376393,40.630434,-75.282548,40.706284","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-75.327459,"wof:geomhash":"c3215a73a271754111b6317d313a32dd","wof:parent_id":404485989,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Bethlehem"}