Thomaston is a city in and the county seat of Upson County, Georgia, United States. The population was 9,638 at the 2006 census. It is the principal city of and is included in the Thomaston, Georgia Micropolitan Statistical Area, which is included in the Atlanta-Sandy Springs-Gainesville, Georgia-Alabama (part) Combined Statistical Area. 76% of Thomastonians completed the 2010 census.
Thomaston was incorporated on June 11, 1825, and designated as the seat of Upson County. The town was named for General Jett Thomas, an Indian fighter in the War of 1812. He is also credited with assisting in the construction of the state capitol at Milledgeville in 1805-7 and Franklin College on the campus of the University of Georgia in 1806.
The town was laid out with parallel streets running north and south, east and west, with the courthouse square in the center of town.