In accordance with Wikipedia definition the most populous city of U.S. state of Illinois is Chicago,whereas in the United States it is 3rd most popolous one. It has a popolation of 2.7 million residents approx.
Area: 606.1 km²Founded: 1833Weather: -2°C, Wind SW at 16 km/h, 75% HumidityPopulation: 2,707,120 (2011)
This made us collect some of the nice wallpapers for Chicago city visitors
USA Chicago Wallpapers