Gaston, SC has a population of 1,388 and is the 13,145th largest city in the United States. The population density is 261 per sq mi which is 77% higher than the South Carolina average and 188% higher than the national average. The median age in Gaston is 35 which is approximately 9% lower than the South Carolina average of 39. In Gaston, 58% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 72% of Gaston residents were born in South Carolina, 22% were born out of state, 1% were born outside of the United States and 5% were foreign born.