QuickFacts

26.4%

of persons in Maricopa County, Arizona are under 18 years

23.1%

of persons in Los Angeles city, California are under 18 years

26.4%

of persons in Maricopa County, Arizona are under 18 years

23.7%

of persons in Cook County, Illinois are under 18 years

Population per square mile in Philadelphia city, Pennsylvania is

11,379.5

Population per square mile in Maricopa County, Arizona is

414.9

The population of Los Angeles County, California is

10,170,292

The population of Los Angeles city, California is

3,971,883

The population of Los Angeles city, California is

3,971,883

12.1%

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

Source: 2010 Census

Source: Population Estimates

Source: 2010 Census