QuickFacts

The population of Pennsylvania is

12,784,227

The population of Ohio is

11,614,373

The population of Maricopa County, Arizona is

4,167,947

13.5%

of persons in New York are 65 years and over

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

Population per square mile in Ohio is

282.3

8.1%

of persons in Harris County, Texas are 65 years and over

29.5%

of persons 25 years+ in Harris County, Texas have a bachelor's degree or higher

24.4%

of persons in Illinois are under 18 years

22.3%

of persons in New York are under 18 years

Source: Population Estimates

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census