QuickFacts

The population of Cook County, Illinois is

5,238,216

8.1%

of persons in Harris County, Texas are 65 years and over

21.6%

of persons in New York city, New York are under 18 years

Population per square mile in Maricopa County, Arizona is

414.9

The population of Pennsylvania is

12,784,227

23.1%

of persons in Chicago city, Illinois are under 18 years

23.1%

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

Population per square mile in New York is

411.2

Population per square mile in Los Angeles County, California is

2,419.6

Population per square mile in Florida is

350.6

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census