QuickFacts

11.9%

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

10.5%

of persons in Los Angeles city, California are 65 years and over

26.4%

of persons in Maricopa County, Arizona are under 18 years

11.9%

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

21.3%

of persons in Florida are under 18 years

Population per square mile in California is

239.1

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

Population per square mile in Chicago city, Illinois is

11,841.8

Median household income of Maricopa County, Arizona is

$54,229

The population of Maricopa County, Arizona is

4,167,947

Source: 2010 Census

Source: American Community Survey

Source: Population Estimates