4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Winnsboro | 1 | 3,196 | 3,366 | -1.05% | 874 | 3.65 | Town |
| Winnsboro Mills | 2 | 1,628 | 2,099 | -1.09% | 663 | 2.46 | CDP |
| Ridgeway | 3 | 249 | 266 | -1.19% | 513 | 0.48 | Town |
| Jenkinsville | 4 | 39 | 41 | 0% | 438 | 0.09 | Town |
Winnsboro is the largest city in Fairfield County, with a population of 3,196.
Jenkinsville is the smallest city in Fairfield County.
There are 4 cities in Fairfield County, South Carolina.