QuickFacts

The population of Harris County, Texas is

4,538,028

23.1%

of persons in Chicago city, Illinois are under 18 years

23.1%

of persons in Chicago city, Illinois are under 18 years

Population per square mile in Houston city, Texas is

3,501.5

Population per square mile in Cook County, Illinois is

5,495.1

12.1%

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

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 Maricopa County, Arizona is

414.9

Median household income of Illinois is

$57,574

Source: Population Estimates

Source: 2010 Census

Source: American Community Survey