QuickFacts

15.4%

of persons in Pennsylvania are 65 years and over

28.0%

of persons in Harris County, Texas are under 18 years

Population per square mile in Michigan is

174.8

24.4%

of persons in Illinois are under 18 years

11.4%

of persons in California are 65 years and over

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

Population per square mile in Michigan is

174.8

The population of Cook County, Illinois is

5,238,216

Population per square mile in New York is

411.2

22.3%

of persons in New York are under 18 years

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census