QuickFacts

11.9%

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

Population per square mile in New York is

411.2

Population per square mile in Chicago city, Illinois is

11,841.8

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

23.1%

of persons in Chicago city, Illinois are under 18 years

12.1%

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

11.4%

of persons in San Diego County, California are 65 years and over

Population per square mile in Cook County, Illinois is

5,495.1

Population per square mile in Texas is

96.3

Median household income of Illinois is

$57,166

Source: 2010 Census

Source: American Community Survey