QuickFacts

Population per square mile in San Diego County, California is

735.8

12.1%

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

Population per square mile in North Carolina is

196.1

Population per square mile in Maricopa County, Arizona is

414.9

The population of San Diego County, California is

3,299,521

23.7%

of persons in Ohio are under 18 years

23.7%

of persons in Ohio are under 18 years

Population per square mile in Cook County, Illinois is

5,495.1

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census