28412 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":34.133158,"wof:name":"28412","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102087757,"locality_id":85980683,"postalcode_id":554780991,"region_id":85688773}],"mz:is_deprecated":0,"lbl:latitude":34.143757,"geom:area":0.006805,"geom:longitude":-77.919445,"wof:id":554780991,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611185159,"wof:belongsto":[102191575,85633793,102087757,85980683,85688773],"wof:concordances":{"gp:id":"12769637"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"geom:area_square_m":6.9650094681349E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-77.95861,34.050324,-77.88296,34.198572","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-77.928152,"wof:geomhash":"3a8cd60864e4581b0ab79a4de58b51fc","wof:parent_id":85980683,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Wilmington"}