QuickFacts

Population per square mile in San Diego County, California is

735.8

24.5%

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

12.1%

of persons in Philadelphia city, Pennsylvania are 65 years and over

The population of Chicago city, Illinois is

2,722,389

28.0%

of persons in Harris County, Texas are under 18 years

The population of Maricopa County, Arizona is

4,087,191

The population of Harris County, Texas is

4,441,370

23.7%

of persons in Michigan are under 18 years

Population per square mile in Florida is

350.6

The population of Maricopa County, Arizona is

4,087,191

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates