4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Winnsboro | 1 | 3,250 | 3,393 | -0.88% | 889 | 4 | Town |
| Winnsboro Mills | 2 | 1,628 | 2,099 | -1.09% | 663 | 2 | CDP |
| Ridgeway | 3 | 252 | 265 | -1.18% | 520 | 0 | Town |
| Jenkinsville | 4 | 38 | 40 | -2.56% | 427 | 0 | Town |
Winnsboro is the largest city in Fairfield County, with a population of 3,250.
Jenkinsville is the smallest city in Fairfield County, with a population of 38.
There are 4 cities in Fairfield County, South Carolina.