91600 is a postalcode and its consensus geometry is derived from frgov.
{"mz:is_ceased":0,"geom:latitude":48.684228,"wof:name":"91600","counts:names_total":0,"wof:placetype":"postalcode","frgov:DEP":"91","frgov:ID":"91600","frgov:_COL6":15251.59,"mz:is_approximate":1,"wof:hierarchy":[{"continent_id":102191581,"country_id":85633147,"county_id":102072547,"localadmin_id":404403095,"locality_id":101751025,"macrocounty_id":404228183,"macroregion_id":404227465,"postalcode_id":421309473,"region_id":85683371}],"mz:is_deprecated":0,"frgov:SURF":7.033266,"geom:area":8.62E-4,"geom:longitude":2.348739,"wof:id":421309473,"frgov:LIB":"Savigny-sur-Orge","counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1480938957,"wof:belongsto":[85683371,102191581,85633147,404403095,404228183,404227465,101751025,102072547],"wof:concordances":{"gp:id":"12728253"},"wof:repo":"whosonfirst-data-postalcode-fr","src:geom":"frgov","wof:country":"FR","counts:names_preferred":0,"frgov:POP2010":36842,"gp:parent_id":"12641544","geom:area_square_m":7033655.259487,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"FR","counts:names_languages":0,"geom:bbox":"2.32640381308,48.6673714513,2.37188241791,48.7024719137","wof:superseded_by":[],"wof:supersedes":[],"wof:geomhash":"4d86702214b3259a4002c692119d888c","wof:parent_id":101751025,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu"}