QuickFacts

The population of Cook County, Illinois is

5,238,216

10.3%

of persons in Chicago city, Illinois are 65 years and over

The population of Los Angeles city, California is

3,971,883

12.1%

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

12.1%

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

23.7%

of persons in Ohio are under 18 years

Population per square mile in San Diego County, California is

735.8

12.5%

of persons in Illinois are 65 years and over

The population of San Diego County, California is

3,299,521

The population of New York is

19,745,289

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates