QuickFacts

The population of Illinois is

12,801,539

11.9%

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

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

26.4%

of persons in Maricopa County, Arizona are under 18 years

11.4%

of persons in San Diego County, California are 65 years and over

23.1%

of persons in Chicago city, Illinois are under 18 years

Median household income of California is

$61,818

10.3%

of persons in Texas are 65 years and over

30.4%

of persons 25 years+ in Maricopa County, Arizona have a bachelor's degree or higher

Population per square mile in Texas is

96.3

Source: Population Estimates

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census