Johnston
- County:
- Edgefield County
- County Seat:
- No
- Area (mi²):
- 2.621
- State:
- South Carolina
Johnston is a town located in Edgefield County, South Carolina. Johnston has a 2026 population of 2,214. Johnston is currently growing at a rate of 2.93% annually and its population has increased by 10.64% since the most recent census, which recorded a population of 2,001 in 2020.