Illinois is a locality and its consensus geometry is derived from whosonfirst.
{"wof:statistical_gore":1,"name:ell_x_preferred":["Ιλινόις"],"mz:is_ceased":0,"geom:latitude":37.431772,"name:ben_x_preferred":["ইলিনয়স"],"wof:coterminous":[404503243],"wof:name":"Illinois","counts:names_total":5,"wof:placetype":"locality","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102085325,"localadmin_id":404503243,"locality_id":1729469263,"region_id":85688555}],"mz:is_deprecated":0,"mz:min_zoom":30,"lbl:latitude":37.43181,"geom:area":0.009601,"geom:longitude":-97.532554,"wof:id":1729469263,"geom:type":"Polygon","wof:lastmodified":1636498592,"wof:belongsto":[85688555,102191575,404503243,85633793,102085325],"mps:latitude":37.43181,"wof:repo":"whosonfirst-data-admin-us","src:geom":"whosonfirst","wof:country":"US","counts:names_preferred":5,"geom:area_square_m":9.4272406343436E7,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","src:geom_via":"uscensus","counts:names_languages":5,"name:tur_x_preferred":["Illinois"],"geom:bbox":"-97.588127,37.387478,-97.476078,37.475761","name:eng_x_preferred":["Illinois"],"name:hin_x_preferred":["इलेनॉइस"],"mps:longitude":-97.532557,"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-97.532557,"wof:geomhash":"cae3452cd0fe7fa412797242448c69ae","wof:parent_id":404503243,"wof:placetype_names":["locality"],"mz:hierarchy_label":1,"wof:placetype_id":102312317,"edtf:cessation":"uuuu"}