QuickFacts

The population of Illinois is

12,801,539

Population per square mile in Harris County, Texas is

2,402.4

The population of Illinois is

12,801,539

Population per square mile in Maricopa County, Arizona is

414.9

Population per square mile in Cook County, Illinois is

5,495.1

23.1%

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

31.4%

of persons 25 years+ in California have a bachelor's degree or higher

26.4%

of persons in Maricopa County, Arizona are under 18 years

Median household income of Philadelphia city, Pennsylvania is

$38,253

30.3%

of persons 25 years+ in Los Angeles County, California have a bachelor's degree or higher

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census

Source: American Community Survey