QuickFacts

23.7%

of persons in Cook County, Illinois are under 18 years

26.4%

of persons in Maricopa County, Arizona are under 18 years

12.1%

of persons in Philadelphia city, Pennsylvania are 65 years and over

The population of Ohio is

11,614,373

The population of Cook County, Illinois is

5,238,216

12.9%

of persons in North Carolina are 65 years and over

22.0%

of persons in Pennsylvania are under 18 years

11.9%

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

The population of Michigan is

9,928,300

23.4%

of persons in San Diego County, California are under 18 years

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census