66860 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":38.12662,"wof:name":"66860","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102084205,"localadmin_id":404504061,"postalcode_id":554738439,"region_id":85688555}],"mz:is_deprecated":0,"lbl:latitude":38.12728,"geom:area":0.050811,"geom:longitude":-96.160703,"wof:id":554738439,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611183101,"wof:belongsto":[102191575,85633793,102084205,404504061,85688555],"wof:concordances":{"gp:id":"12787018"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588407","geom:area_square_m":4.94242836257787E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-96.358076,37.997627,-95.977057,38.230736","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-96.165629,"wof:geomhash":"baf79eef0a7eecbde5ddedeeb0672d87","wof:parent_id":404504061,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Madison"}