01566 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":42.102401,"wof:name":"01566","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102084655,"localadmin_id":404476619,"locality_id":85950751,"postalcode_id":554697139,"region_id":85688645}],"mz:is_deprecated":0,"lbl:latitude":42.103214,"geom:area":0.008271,"geom:longitude":-72.081161,"wof:id":554697139,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184653,"wof:belongsto":[102191575,85633793,102084655,404476619,85950751,85688645],"wof:concordances":{"gp:id":"12758511"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588713","geom:area_square_m":7.5880514857492E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-72.135715,42.028723,-72.023905,42.174428","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-72.079545,"wof:geomhash":"008f59cc4a94738ef228b3cc88fa27cf","wof:parent_id":85950751,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Sturbridge"}