Lamar is a town in Darlington County, South Carolina, United States. The population was 1,015 at the 2000 census. It is part of the Florence Metropolitan Statistical Area.
Lamar is located at 34°10′13″N 80°3′45″W / 34.17028°N 80.0625°W / 34.17028; -80.0625 (34.170388, -80.062526).
According to the United States Census Bureau, the town has a total area of 1.2 square miles (3.0 km²), all of it land.