50606 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":42.747243,"wof:name":"50606","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102086621,"postalcode_id":554726137,"region_id":85688713}],"mz:is_deprecated":0,"lbl:latitude":42.747316,"geom:area":0.020265,"geom:longitude":-91.683892,"wof:id":554726137,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184886,"wof:belongsto":[102191575,85633793,102086621,85688713],"wof:concordances":{"gp:id":"12780076"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"2347574","geom:area_square_m":1.84015043788475E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-91.804881,42.672946,-91.551826,42.837717","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-91.691307,"wof:geomhash":"090bc45eb9f6412929ac70d89bc55775","wof:parent_id":102086621,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Arlington"}