South Miami Heights, FL has a population of 38,736 and is the 1,074th largest city in the United States. The population density is 7,908 per sq mi which is 2594% higher than the Florida average and 8629% higher than the national average. The median age in South Miami Heights is 37 which is approximately 11% lower than the Florida average of 42. In South Miami Heights, 47% of the population over 15 years of age are married, 30% speak English and 68% speak Spanish. 38% of South Miami Heights residents were born in Florida, 7% were born out of state, 3% were born outside of the United States and 52% were foreign born.