30004 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":34.143283,"wof:name":"30004","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102083603,"locality_id":85937171,"postalcode_id":554712659,"region_id":85688535}],"mz:is_deprecated":0,"lbl:latitude":34.145614,"mz:postal_locality_alt":["Milton","Roswell"],"geom:area":0.014721,"geom:longitude":-84.299444,"wof:id":554712659,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1611183708,"wof:belongsto":[102191575,85633793,102083603,85937171,85688535],"wof:concordances":{"gp:id":"12770491"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"geom:area_square_m":1.5065086035301E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-84.381442,34.072783,-84.213447,34.228105","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-84.291894,"wof:geomhash":"c741c416e2429495be7112210e045ce6","wof:parent_id":85937171,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Alpharetta"}