QuickFacts

23.7%

of persons in Cook County, Illinois are under 18 years

23.1%

of persons in Chicago city, Illinois are under 18 years

The population of Pennsylvania is

12,802,503

Population per square mile in California is

239.1

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

21.3%

of persons in Florida are under 18 years

The population of San Diego County, California is

3,263,431

31.9%

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

The population of Harris County, Texas is

4,441,370

Population per square mile in San Diego County, California is

735.8

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: American Community Survey

Source: Population Estimates

Source: 2010 Census