Mount Croghan is a town in Chesterfield County, South Carolina, United States.

South Carolina Highway 268 leads southwest from Mount Croghan 13 miles (21 km) to Jefferson.

According to the United States Census Bureau, the town has a total area of 0.77 square miles (2.0 km2), all land.

28.8% of all households were made up of individuals, and 15.2% had someone living alone who was 65 years of age or older.

About 2.6% of families and 3.8% of the population were below the poverty line, including none of those under the age of eighteen and 13.0% of those 65 or over.