QuickFacts

11.9%

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

The population of Maricopa County, Arizona is

4,167,947

The population of Cook County, Illinois is

5,238,216

23.9%

of persons in North Carolina are under 18 years

The population of Michigan is

9,928,300

The population of Illinois is

12,801,539

17.3%

of persons in Florida are 65 years and over

Population per square mile in New York city, New York is

27,012.5

The population of Pennsylvania is

12,784,227

23.1%

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

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census