Winnsboro is a town located in Fairfield County, South Carolina, within the United States. It serves as the county seat for Fairfield County and is situated within the Columbia, South Carolina metropolitan area, where it functions as a suburb of Columbia.
The population of Winnsboro was recorded at 3,550 during the 2010 census. By the 2020 census, the population had decreased by approximately 9.5% to 3,215 residents.