QuickFacts

26.4%

of persons in Maricopa County, Arizona are under 18 years

10.5%

of persons in Los Angeles city, California are 65 years and over

28.0%

of persons in Harris County, Texas are under 18 years

Population per square mile in Maricopa County, Arizona is

414.9

The population of Cook County, Illinois is

5,238,216

23.4%

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

The population of Pennsylvania is

12,784,227

14.1%

of persons in Ohio are 65 years and over

Population per square mile in Michigan is

174.8

23.1%

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

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census