Swift Trail Junction, AZ has a population of 3,262 and is the 8,387th largest city in the United States. The population density is 889 per sq mi which is 1447% higher than the Arizona average and 882% higher than the national average. The median age in Swift Trail Junction is 39 which is approximately 6% higher than the Arizona average of 37. In Swift Trail Junction, 53% of the population over 15 years of age are married, 72% speak English and 21% speak Spanish. 42% of Swift Trail Junction residents were born in Arizona, 50% were born out of state, 1% were born outside of the United States and 6% were foreign born.