Maricopa -- U.S. County in Arizona Population (2000): 3072149 Housing Units (2000): 1250231 Land area (2000): 9203.137806 sq. miles (23836.016480 sq. km) Water area (2000): 21.128468 sq. miles (54.722478 sq. km) Total area (2000): 9224.266274 sq. miles (23890.738958 sq. km) Located within: Arizona (AZ), FIPS 04 Location: 33.494514 N, 112.087906 W Headwords: Maricopa Maricopa, AZ Maricopa County Maricopa County, AZ