19966 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":38.581151,"wof:name":"19966","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102083887,"locality_id":85931617,"postalcode_id":554706677,"region_id":85688611}],"mz:is_deprecated":0,"lbl:latitude":38.579422,"mz:postal_locality_alt":["Bethany Beach"],"geom:area":0.025401,"geom:longitude":-75.281557,"wof:id":554706677,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1611182709,"wof:belongsto":[102191575,85633793,102083887,85931617,85688611],"wof:concordances":{"gp:id":"12765827"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12587801","geom:area_square_m":2.45533722258768E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-75.433192,38.452028,-75.085163,38.673636","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-75.277196,"wof:geomhash":"aa74c77910b447b74a899a5da4e99d3e","wof:parent_id":85931617,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Millsboro"}