Fairfax
- County:
- Allendale County
- County Seat:
- No
- Area (mi²):
- 3.312
- State:
- South Carolina
Fairfax is a town located in Allendale County, South Carolina. Fairfax has a 2026 population of 1,389. Fairfax is currently declining at a rate of -0.79% annually and its population has decreased by -6.59% since the most recent census, which recorded a population of 1,487 in 2020.