Waterloo is a town in Laurens County, South Carolina, United States.

[5] Rosemont Plantation was added to the National Register of Historic Places in 1993.

[7] According to the United States Census Bureau, the town has a total area of 1.4 square miles (3.7 km2), all land.

20.0% of all households were made up of individuals, and 9.3% had someone living alone who was 65 years of age or older.

About 5.7% of families and 12.3% of the population were below the poverty line, including 6.4% of those under the age of eighteen and 21.4% of those 65 or over.