Maricopa, AZ has a population of 45,473 and is the 904th largest city in the United States. The population density is 1,063 per sq mi which is 1749% higher than the Arizona average and 1073% higher than the national average. The median age in Maricopa is 35 which is approximately 6% lower than the Arizona average of 37. In Maricopa, 58% of the population over 15 years of age are married, 82% speak English and 12% speak Spanish. 31% of Maricopa residents were born in Arizona, 58% were born out of state, 1% were born outside of the United States and 10% were foreign born.