The Illinois Constitution is the governing body of the state of Illinois. State nickname: Land of Lincoln, The Prairie State Other U.S. States Capital Springfield Largest city Chicago Governor Rod Blagojevich (D) Senators Richard Durbin (D) Barack Obama (D) Official language(s) English Area 149,998 km² (25th) - Land 143,968 km² - Water 6,030 km² (4. ...