union Click to View Image Official language(s) English [ 1 ] Spoken language(s) English (80.8%) Spanish (10.9%) Other (5.1%) [ 2 ] Demonym Illinoisan Capital Springfield Largest city Chicago Largest metro area Chicago metropolitan area Area   Ranked 25th in the U.S.  - Total 57,914 sq mi (149,998 km 2 )  - Width 210 miles (340 km)