01833 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":42.724003,"wof:name":"01833","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102084463,"localadmin_id":404475941,"postalcode_id":554697267,"region_id":85688645}],"mz:is_deprecated":0,"lbl:latitude":42.727879,"mz:postal_locality_alt":["Haverhill","Marlboro"],"geom:area":0.003743,"geom:longitude":-70.982105,"wof:id":554697267,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611184644,"wof:belongsto":[102191575,85633793,102084463,404475941,85688645],"wof:concordances":{"gp:id":"12758591"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588704","geom:area_square_m":3.4002832658442E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-71.034638,42.694352,-70.924125,42.753833","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-70.982036,"wof:geomhash":"d644c4938db832094a03c021ef6891e3","wof:parent_id":404475941,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Georgetown"}