QuickFacts

Population per square mile in Los Angeles County, California is

2,419.6

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

Population per square mile in San Diego County, California is

735.8

23.4%

of persons in San Diego County, California are under 18 years

10.9%

of persons in Los Angeles County, California are 65 years and over

24.4%

of persons in Illinois are under 18 years

Population per square mile in Cook County, Illinois is

5,495.1

21.3%

of persons in Florida are under 18 years

Population per square mile in Houston city, Texas is

3,501.5

10.5%

of persons in Los Angeles city, California are 65 years and over

Source: 2010 Census