98031 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":47.404939,"wof:name":"98031","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102086191,"locality_id":101730431,"postalcode_id":554755379,"region_id":85688623}],"mz:is_deprecated":0,"lbl:latitude":47.405479,"mz:postal_locality_alt":["Auburn"],"geom:area":0.002345,"geom:longitude":-122.195608,"wof:id":554755379,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611182579,"wof:belongsto":[102191575,85633793,102086191,101730431,85688623],"wof:concordances":{"gp:id":"12798904"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"geom:area_square_m":1.9625476303001E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-122.231109,47.379656,-122.161506,47.432164","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-122.195772,"wof:geomhash":"4b3b66fc6c72bf70d117c63b19826df4","wof:parent_id":101730431,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Kent"}