QuickFacts

The population of Cook County, Illinois is

5,238,216

In California

57.2%

of females 16 years+ are in the civilian labor force

The population of Chicago city, Illinois is

2,720,546

The population of Philadelphia city, Pennsylvania is

1,567,442

The population of San Diego County, California is

3,299,521

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

10.3%

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

23.4%

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

Population per square mile in Illinois is

231.1

The population of Chicago city, Illinois is

2,720,546

Source: Population Estimates

Source: American Community Survey

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates