Sierra Vista, AZ has a population of 44,381 and is the 921st largest city in the United States. The population density is 292 per sq mi which is 407% higher than the Arizona average and 222% higher than the national average. The median age in Sierra Vista is 33 which is approximately 11% lower than the Arizona average of 37. In Sierra Vista, 61% of the population over 15 years of age are married, 79% speak English and 14% speak Spanish. 24% of Sierra Vista residents were born in Arizona, 61% were born out of state, 6% were born outside of the United States and 9% were foreign born.