Maricopa County, Arizona

county in Arizona, United States
Flag of Maricopa County.svg

Maricopa County (/ˌmærɪˈkpə/ MARR-i-KOH-pə) is a county in the south-central part of the U.S. state of Arizona. As of the 2010 census, its population was 3,817,117,[1] making it the state's most populous county. It is more populous than 23 states.

The county seat is Phoenix,[2] the state capital and fifth-most populous city in the country.


  1. "State & County QuickFacts". United States Census Bureau. Archived from the original on July 6, 2011. Retrieved May 18, 2014.
  2. "Find a County". National Association of Counties. Retrieved June 7, 2011.