Superior, AZ has a population of 2,895 and is the 8,989th largest city in the United States. The population density is 1,475 per sq mi which is 2466% higher than the Arizona average and 1528% higher than the national average. The median age in Superior is 44 which is approximately 19% higher than the Arizona average of 37. In Superior, 48% of the population over 15 years of age are married, 58% speak English and 42% speak Spanish. 67% of Superior residents were born in Arizona, 27% were born out of state, 1% were born outside of the United States and 5% were foreign born.