5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bennettsville | 1 | 7,398 | 7,989 | -1.31% | 1,198 | 6 | City |
| McColl | 2 | 1,930 | 2,067 | -1.18% | 1,838 | 1 | Town |
| Clio | 3 | 559 | 603 | -1.24% | 653 | 1 | Town |
| Blenheim | 4 | 104 | 113 | -0.95% | 159 | 1 | Town |
| Tatum | 5 | 68 | 74 | -1.45% | 75 | 1 | Town |
Bennettsville is the largest city in Marlboro County, with a population of 7,398.
Tatum is the smallest city in Marlboro County, with a population of 68.
There are 5 cities in Marlboro County, South Carolina.