3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sumter | 1 | 42,836 | 43,445 | -0.28% | 1,290 | 33 | City |
| Mayesville | 2 | 549 | 552 | -0.18% | 536 | 1 | Town |
| Pinewood | 3 | 500 | 503 | -0.2% | 467 | 1 | Town |
Sumter is the largest city in Sumter County, with a population of 42,836.
Pinewood is the smallest city in Sumter County, with a population of 500.
There are 3 cities in Sumter County, South Carolina.