Sun City, AZ has a population of 39,363 and is the 1,053rd largest city in the United States. The population density is 2,730 per sq mi which is 4648% higher than the Arizona average and 2913% higher than the national average. The median age in Sun City is 73 which is approximately 96% higher than the Arizona average of 37. In Sun City, 77% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 5% of Sun City residents were born in Arizona, 89% were born out of state, 1% were born outside of the United States and 5% were foreign born.