Fountain Hills, AZ has a population of 23,863 and is the 1,832nd largest city in the United States. The population density is 1,177 per sq mi which is 1948% higher than the Arizona average and 1199% higher than the national average. The median age in Fountain Hills is 57 which is approximately 53% higher than the Arizona average of 37. In Fountain Hills, 69% of the population over 15 years of age are married, 93% speak English and 3% speak Spanish. 17% of Fountain Hills residents were born in Arizona, 75% were born out of state, 1% were born outside of the United States and 7% were foreign born.