Blackville
- County:
- Barnwell County
- County Seat:
- No
- Area (mi²):
- 8.932
- State:
- South Carolina
Blackville is a town located in Barnwell County, South Carolina. Blackville has a 2026 population of 1,906. Blackville is currently growing at a rate of 0.05% annually but its population has decreased by -0.99% since the most recent census, which recorded a population of 1,925 in 2020.