Bennettsville is a city located in the U.S. state of South Carolina on the Great Pee Dee River. As the county seat of Marlboro County, Bennettsville is noted for its historic homes and buildings from the 19th and early 20th centuries — including the Bennettsville Historic District which is listed on the National Register of Historic Places.According to the 2000 census, Bennettsville has a population of 9,425.