QuickFacts

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

Population per square mile in Florida is

350.6

23.1%

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

12.1%

of persons in Maricopa County, Arizona are 65 years and over

Population per square mile in Cook County, Illinois is

5,495.1

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

27,012.5

Population per square mile in Los Angeles County, California is

2,419.6

Population per square mile in California is

239.1

The population of California is

39,250,017

11.9%

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

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census