Quick Facts
CapitalSpringfield
Largest CityChicago
Population12,713,634
Per Capita Income$32,755
NicknamePrairie State
StatehoodDecember 3, 1818
State BirdCardinal
State FlowerViolet
State TreeWhite Oak
State SongIllinois
Geography
Land Area55,393 sq mi
Water Area2,325 sq mi
Total Area57,718 sq mi
RegionMidwest
About Illinois
Illinois, known as the “Prairie State,” has a population of 12,713,634 and a per capita income of $32,755. The state capital is Springfield and the largest city is Chicago. Illinois joined the Union on December 3, 1818 and covers 57,718 square miles across the Midwest region. Explore 230 cities and towns across Illinois with detailed data on demographics, crime rates, cost of living, schools, weather, and more.
Explore Illinois Data
Cities in Illinois
Browse all cities →Explore 230 cities and towns in Illinois with detailed demographic, economic, and quality of life data.
Showing major cities — full directory of 230 cities coming soon
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