Illinois is a state located in the Midwestern United States. According to the 2010 United States Census, Illinois is the 6th most populous state with 12,831,549 inhabitants but the 24th largest by land area spanning 55,518.93 square miles (143,793.4 km2) of land. Illinois is divided into 102 counties and contains 1,299 incorporated municipalities consisting of cities, towns, and villages.
- "GCT-PH1 – Population, Housing Units, Area, and Density: 2010 – State — Place and (in selected states) County Subdivision". 2010 United States Census. United States Census Bureau. Archived from the original on February 13, 2020. Retrieved June 17, 2016.
- "Illinois: 2010 Population and Housing Unit Counts 2010 Census of Population and Housing" (PDF). 2010 United States Census. United States Census Bureau. September 2012. p.��18. Retrieved June 17, 2016.
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