Tucson, AZ has a population of 527,586 and is the 33rd largest city in the United States. The population density is 2,226 per sq mi which is 3772% higher than the Arizona average and 2357% higher than the national average. The median age in Tucson is 33 which is approximately 11% lower than the Arizona average of 37. In Tucson, 42% of the population over 15 years of age are married, 66% speak English and 29% speak Spanish. 44% of Tucson residents were born in Arizona, 39% were born out of state, 2% were born outside of the United States and 15% were foreign born.