5 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Summerville | 1 | 53,042 | 50,957 | 0.79% | 2,353 | 23 | Town |
| St. George | 2 | 1,859 | 1,838 | 0.22% | 653 | 3 | Town |
| Ridgeville | 3 | 1,084 | 1,834 | -12.16% | 356 | 3 | Town |
| Harleyville | 4 | 757 | 671 | 2.3% | 510 | 1 | Town |
| Reevesville | 5 | 195 | 202 | -1.02% | 121 | 2 | Town |
Summerville is the largest city in Dorchester County, with a population of 53,042.
Reevesville is the smallest city in Dorchester County, with a population of 195.
There are 5 cities in Dorchester County, South Carolina.