In what county is Phoenix, Ariz.?

Phoenix, Ariz., is in Maricopa County. The county ranks as the fourth largest in the United States and the most populous in Arizona. In 2013, Maricopa's estimated population was 4,009,412, based on data gathered from the U.S. Census Bureau.

There are 15 counties comprising the state of Arizona. Pima County and Pinal County follows Maricopa in terms of population size. The majority of Maricopa's ethnic groups are composed of whites, Hispanics and African-Americans. In Phoenix, whites alone made up around 65.9 percent of the city's total number of inhabitants in 2010. Aside from Phoenix, other cities in Maricopa County include Gilbert, Chandler, Scottsdale, Surprise and Youngtown.