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 located at 33°48′57″N 81°6′3″W / 33.81583°N 81.10083°W / 33.81583; -81.10083 (33.815927, -81.100937).
According to the United States Census Bureau, the town has a total area of 3.4 square miles (8.9 km²), all of it land.