QuickFacts

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

9.0%

of persons in Houston city, Texas are 65 years and over

Population per square mile in Ohio is

282.3

28.0%

of persons in Harris County, Texas are under 18 years

Population per square mile in San Diego County, California is

735.8

8.1%

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

12.1%

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

The population of Illinois is

12,801,539

Population per square mile in Chicago city, Illinois is

11,841.8

Population per square mile in Illinois is

231.1

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census