Maricopa County Quick Facts

  1. Population
  2. Land
  3. History
  4. County Seal

  • The nation’s 4th largest county in terms of population
  • 2022 population of 4.5 million people, according to U.S. Census Bureau
  • Makes up more than half of Arizona’s population
  • Fastest-growing county in the United States, with more than 56,000 people added between July 2021-2022