QuickFacts

11.9%

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

8.1%

of persons in Harris County, Texas are 65 years and over

The population of Houston city, Texas is

2,296,224

Population per square mile in Pennsylvania is

283.9

The population of Maricopa County, Arizona is

4,167,947

The population of California is

39,250,017

Population per square mile in Illinois is

231.1

25.9%

of persons in Houston city, Texas are under 18 years

Population per square mile in Michigan is

174.8

The population of Chicago city, Illinois is

2,720,546

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates