21802 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":38.344771,"wof:name":"21802","counts:names_total":0,"wof:placetype":"postalcode","wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102082715,"locality_id":85949177,"postalcode_id":554759457,"region_id":85688501}],"mz:is_deprecated":0,"lbl:latitude":38.344771,"geom:area":1.4E-5,"geom:longitude":-75.582696,"wof:id":554759457,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1480790298,"wof:belongsto":[85688501,102191575,85633793,85949177,102082715],"wof:concordances":{"gp:id":"12766734"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"geom:area_square_m":135945.69287,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-75.585341,38.343064,-75.579973,38.346944","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-75.582696,"wof:geomhash":"6617f909f45b5658694fff396c6f34f0","wof:parent_id":85949177,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu"}