Six Mile, SC has a population of 814 and is the 16,491st largest city in the United States. The population density is 399 per sq mi which is 171% higher than the South Carolina average and 341% higher than the national average. The median age in Six Mile is 37 which is approximately 5% lower than the South Carolina average of 39. In Six Mile, 70% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 61% of Six Mile residents were born in South Carolina, 37% were born out of state, 0% were born outside of the United States and 2% were foreign born.