QuickFacts

24.4%

of persons in Illinois are under 18 years

11.4%

of persons in San Diego County, California are 65 years and over

Population per square mile in Michigan is

174.8

26.9%

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

Population per square mile in California is

239.1

23.7%

of persons in Ohio are under 18 years

Population per square mile in Pennsylvania is

283.9

Population per square mile in Harris County, Texas is

2,402.4

10.9%

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

26.4%

of persons in Maricopa County, Arizona are under 18 years

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census