QuickFacts

22.5%

of persons in Philadelphia city, Pennsylvania are under 18 years

8.1%

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

The population of Illinois is

12,801,539

The population of Philadelphia city, Pennsylvania is

1,567,442

Population per square mile in Harris County, Texas is

2,402.4

12.1%

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

Population per square mile in Maricopa County, Arizona is

414.9

The population of New York is

19,745,289

The population of New York is

19,745,289

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census