Sierra Vista Southeast, AZ has a population of 15,768 and is the 2,723rd largest city in the United States. The population density is 142 per sq mi which is 147% higher than the Arizona average and 57% higher than the national average. The median age in Sierra Vista Southeast is 47 which is approximately 28% higher than the Arizona average of 37. In Sierra Vista Southeast, 65% of the population over 15 years of age are married, 84% speak English and 13% speak Spanish. 27% of Sierra Vista Southeast residents were born in Arizona, 63% were born out of state, 4% were born outside of the United States and 6% were foreign born.