QuickFacts

13.8%

of persons in Michigan are 65 years and over

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

23.7%

of persons in Ohio are under 18 years

Population per square mile in Chicago city, Illinois is

11,841.8

12.5%

of persons in Illinois are 65 years and over

17.3%

of persons in Florida are 65 years and over

11.4%

of persons in California are 65 years and over

12.1%

of persons in Maricopa County, Arizona are 65 years and over

12.1%

of persons in New York city, New York are 65 years and over

25.0%

of persons in California are under 18 years

Source: 2010 Census