| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sumter | 1 | 42,995 | 43,451 | -0.23% | 1,295 | 33 | City |
| Mayesville | 2 | 554 | 552 | 0% | 541 | 1 | Town |
| Pinewood | 3 | 497 | 501 | -0.2% | 464 | 1 | Town |
Sumter is the largest city in Sumter County, with a population of 42,995.
Pinewood is the smallest city in Sumter County, with a population of 497.
There are 3 cities in Sumter County, South Carolina.