QuickFacts

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

23.1%

of persons in Chicago city, Illinois are under 18 years

23.7%

of persons in Cook County, Illinois are under 18 years

23.4%

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

The population of Illinois is

12,801,539

The population of Los Angeles city, California is

3,971,883

11.4%

of persons in San Diego County, California are 65 years and over

The population of Chicago city, Illinois is

2,720,546

The population of Pennsylvania is

12,784,227

Population per square mile in Florida is

350.6

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census