QuickFacts

The population of Illinois is

12,801,539

12.1%

of persons in Maricopa County, Arizona are 65 years and over

26.4%

of persons in Maricopa County, Arizona are under 18 years

23.1%

of persons in Chicago city, Illinois are under 18 years

25.7%

of persons in Georgia are under 18 years

28.0%

of persons in Harris County, Texas are under 18 years

The population of Illinois is

12,801,539

Population per square mile in Ohio is

282.3

Population per square mile in New York is

411.2

23.7%

of persons in Ohio are under 18 years

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census