Mountville is an unincorporated community and census-designated place (CDP) in Laurens County, South Carolina, United States. The population was 108 at the 2010 census, down from 130 at the 2000 census. It is portion of the Greenville–Mauldin–Easley Metropolitan Statistical Area.

Mountville is located in southern Laurens County at 34°21′45″N 81°58′14″W / 34.36250°N 81.97056°W / 34.36250; -81.97056 (34.362544, -81.970573). South Carolina Highway 72 runs along the eastern side of the community, leading northeast 10 miles (16 km) to Clinton and southwest 17 miles (27 km) to Greenwood. South Carolina Highway 39 forms the western edge of the Mountville CDP; it leads north 12 miles (19 km) to Laurens, the county seat, and south 3 miles (5 km) to Highway 72 at Cross Hill.

According to the United States Census Bureau, the Mountville CDP has a total area of 2.9 square miles (7.4 km), of which 0.02 square miles (0.04 km²), or 0.54%, are water. The CDP drains east to Beaverdam Creek, a tributary of the Little River, part of the Saluda River watershed, and south to North Campbell Creek, a tributary of Mudlick Creek, which then flows to the Little River and thence the Saluda.

As of the census of 2000, there were 130 people, 51 households, and 41 families residing in the CDP. The population density was 45.9 people per square mile (17.7/km²). There were 59 housing units at an average density of 20.8/sq mi (8.0/km). The racial makeup of the CDP was 83.85% White, 15.38% African American, and 0.77% from two or more races.