QuickFacts

Population per square mile in Cook County, Illinois is

5,495.1

23.4%

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

12.1%

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

The population of San Diego County, California is

3,263,431

23.1%

of persons in Chicago city, Illinois are under 18 years

13.5%

of persons in New York are 65 years and over

35.1%

of persons 25 years+ in San Diego County, California have a bachelor's degree or higher

12.1%

of persons in Maricopa County, Arizona are 65 years and over

28.0%

of persons in Harris County, Texas are under 18 years

28.0%

of persons in Harris County, Texas are under 18 years

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census