Illinois Flag

Illinois

Statehood Year:
1818
Capital:
Springfield
Largest Cities:
Chicago, Aurora, Naperville
Abbreviation:
IL

Illinois is a state in the Midwest region of the United States, known for the Great Lakes shoreline, prairie lands, and urban Chicago. It has a population of 12,778,100, making it the 6th most populated state in the country. The capital city is Springfield. Illinois has a diverse economy with financial services and manufacturing strength.

12,778,100
Total Population
221
Population Density (mi²)
6
Population Rank
67.9K 0.53%
Annual Population Growth

Illinois Population

Demographics

Economics and Income Statistics

Population by County

Illinois County Populations

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)