What is the population of Maricopa County? Maricopa County is where Phoenix, Arizona is located. Other major Arizona cities like Mesa, Scottsdale, Tempe and Glendale, are also in Maricopa County. The U.S. Census Bureau provides county population statistics at each full Census in years ending in a "0", as well as population estimates at various intermediate years.
Population of Maricopa County, 20103,817,117
Maricopa County Population Growth since 2000: 24.2%
From 2000 to 2010 Maricopa County had the 14th highest growth rate of all counties in the U.S. Maricopa County had the 4th largest population of counties in the U.S.