28726 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":35.281166,"wof:name":"28726","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102080983,"locality_id":85981555,"postalcode_id":554711735,"region_id":85688773}],"mz:is_deprecated":0,"lbl:latitude":35.280999,"mz:postal_locality_alt":["Burnsville"],"geom:area":6.14E-4,"geom:longitude":-82.418162,"wof:id":554711735,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611185326,"wof:belongsto":[102191575,85633793,102080983,85981555,85688773],"wof:concordances":{"gp:id":"12769874"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12589418","geom:area_square_m":6192994.462099,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-82.433551,35.261751,-82.402445,35.299142","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-82.416555,"wof:geomhash":"08266ec046a5c51afbdea18569e9b5e1","wof:parent_id":85981555,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"East Flat Rock"}