QuickFacts

Population per square mile in Chicago city, Illinois is

11,841.8

24.5%

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

Population per square mile in Michigan is

174.8

13.8%

of persons in Michigan are 65 years and over

15.4%

of persons in Pennsylvania are 65 years and over

11.4%

of persons in California are 65 years and over

26.4%

of persons in Maricopa County, Arizona are under 18 years

21.3%

of persons in Florida are under 18 years

12.9%

of persons in North Carolina are 65 years and over

17.3%

of persons in Florida are 65 years and over

Source: 2010 Census