QuickFacts

24.5%

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

14.1%

of persons in Ohio are 65 years and over

The population of Chicago city, Illinois is

2,720,546

11.9%

of persons in Cook County, Illinois are 65 years and over

Population per square mile in Cook County, Illinois is

5,495.1

The population of Pennsylvania is

12,784,227

Population per square mile in New York is

411.2

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

23.1%

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

23.7%

of persons in Cook County, Illinois are under 18 years

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census