28575 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":34.703461,"wof:name":"28575","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102080875,"postalcode_id":554788681,"region_id":85688773}],"mz:is_deprecated":0,"lbl:latitude":34.707959,"geom:area":0.001367,"geom:longitude":-76.890318,"wof:id":554788681,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184757,"wof:belongsto":[102191575,85633793,102080875,85688773],"wof:concordances":{"gp:id":"12769746"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12589389","geom:area_square_m":1.3898140144167E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-76.912322,34.682325,-76.8665,34.722599","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-76.883568,"wof:geomhash":"73eecabb04a551e88477bce14afadebe","wof:parent_id":102080875,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Salter Path"}