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Maricopa County is located in the central part of the U.S. state of Arizona. As of July 2007, its population was 3,880,181. The county seat is Phoenix.
There are 12 Indian reservations located in the county. The largest of these are the Salt River Pima Maricopa Indian Community (East of Scottsdale) and the Gila River Indian Community (South of Phoenix), both of which have casino gambling.