Gaston is a town in Lexington County, South Carolina, United States. The population was 1,645 at the 2010 census. It is part of the Columbia, South Carolina Metropolitan Statistical Area.
Gaston is named for the Gaston family.
Gaston is located on the banks of Bull Swamp Creek. According to the United States Census Bureau, the town has a total area of 3.4 square miles (8.8 km2), all land.
As of the census of 2000, there were 1,304 people, 484 households, and 366 families residing in the town. The population density was 380.6 people per square mile (146.8/km2). There were 532 housing units at an average density of 155.3 per square mile (59.9/km2). The racial makeup of the town was 95.71% White, 1.07% African American, 0.84% Native American, 0.46% from other races, and 1.92% from two or more races. Hispanic or Latino of any race were 1.92% of the population.