QuickFacts

12.1%

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

21.6%

of persons in New York city, New York are under 18 years

15.4%

of persons in Pennsylvania are 65 years and over

Population per square mile in San Diego County, California is

735.8

Population per square mile in Illinois is

231.1

10.3%

of persons in Chicago city, Illinois are 65 years and over

8.1%

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

Population per square mile in New York is

411.2

Median household income of Florida is

$47,507

22.3%

of persons in New York are under 18 years

Source: 2010 Census

Source: American Community Survey

Source: 2010 Census