Maricopa is a city in Pinal County, Arizona, United States. During a December 31, 2005 special census, the fast-growing city was reported to have a population of 15,934. The growth rate began to decline in 2006 and continued to fall in 2007 as the local housing market slumped. Maricopa apartments for rent comparison page shows most up to date rent information on Maricopa apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.