Allendale
- County:
- Allendale County
- County Seat:
- No
- Area (mi²):
- 3.31
- State:
- South Carolina
Allendale is a town located in Allendale County, South Carolina. Allendale has a 2026 population of 2,496. Allendale is currently declining at a rate of -0.87% annually and its population has decreased by -6.9% since the most recent census, which recorded a population of 2,681 in 2020.