QuickFacts

12.5%

of persons in Illinois are 65 years and over

11.4%

of persons in California are 65 years and over

24.4%

of persons in Illinois are under 18 years

The population of California is

39,250,017

The population of Maricopa County, Arizona is

4,167,947

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

24.5%

of persons in Los Angeles County, California are under 18 years

The population of Ohio is

11,614,373

25.7%

of persons in Georgia are under 18 years

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census