3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sumter | 1 | 42,714 | 43,445 | -0.28% | 1,287 | 33 | City |
| Mayesville | 2 | 549 | 552 | 0% | 536 | 1 | Town |
| Pinewood | 3 | 500 | 503 | 0% | 467 | 1 | Town |
Sumter is the largest city in Sumter County, with a population of 42,714.
Pinewood is the smallest city in Sumter County, with a population of 500.
There are 3 cities in Sumter County, South Carolina.