37756 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":36.304611,"wof:name":"37756","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102087113,"postalcode_id":554717019,"region_id":85688701}],"mz:is_deprecated":0,"lbl:latitude":36.304565,"geom:area":0.025636,"geom:longitude":-84.419813,"wof:id":554717019,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611185027,"wof:belongsto":[102191575,85633793,102087113,85688701],"wof:concordances":{"gp:id":"12774109"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12589987","geom:area_square_m":2.55457356879179E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-84.536231,36.163478,-84.329927,36.42192","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-84.419801,"wof:geomhash":"73a946061cb488880c8ec119e3b9c10a","wof:parent_id":102087113,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Huntsville"}