QuickFacts

12.5%

of persons in Illinois 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

23.7%

of persons in Cook County, Illinois are under 18 years

Population per square mile in Cook County, Illinois is

5,495.1

Median household income of Michigan is

$49,087

Median household income of Maricopa County, Arizona is

$53,689

The population of California is

39,144,818

The population of Michigan is

9,922,576

11.9%

of persons in Cook County, Illinois are 65 years and over

Source: 2010 Census

Source: American Community Survey

Source: Population Estimates

Source: 2010 Census