Thomson, incorporated February 15, 1854, is a city in McDuffie County, Georgia, United States. The population was 6,828 at the 2000 census. The city is the county seat of McDuffie County.Thomson's nickname is "The Camellia City of the South", in honor of the thousands of camellia plants throughout the city. It is part of the Augusta – Richmond County Metropolitan Statistical Area.
This city was once entirely owned by plantation owner John Langston. The city was named for John Edgar Thomson of the Georgia Railroad. The Old Rock House, built in 1785, is said to be one of Georgia's oldest documented houses with design intact. Built by Thomas Ansley, the home is said to be the home of ancestors of former president Jimmy Carter.