QuickFacts

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 Michigan is

174.8

Population per square mile in Maricopa County, Arizona is

414.9

12.1%

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

Population per square mile in Ohio is

282.3

The population of California is

39,250,017

21.3%

of persons in Florida are under 18 years

11.9%

of persons in Cook County, Illinois are 65 years and over

17.3%

of persons in Florida are 65 years and over

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census