Surprise, AZ has a population of 127,492 and is the 217th largest city in the United States. The population density is 1,182 per sq mi which is 1956% higher than the Arizona average and 1205% higher than the national average. The median age in Surprise is 40 which is approximately 8% higher than the Arizona average of 37. In Surprise, 66% of the population over 15 years of age are married, 86% speak English and 9% speak Spanish. 31% of Surprise residents were born in Arizona, 59% were born out of state, 2% were born outside of the United States and 9% were foreign born.