| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Summerville | 1 | 53,623 | 50,944 | 0.84% | 2,378 | 23 | Town |
| St. George | 2 | 1,875 | 1,833 | 0.37% | 659 | 3 | Town |
| Ridgeville | 3 | 1,080 | 1,832 | -12.2% | 354 | 3 | Town |
| Harleyville | 4 | 791 | 683 | 2.33% | 533 | 1 | Town |
| Reevesville | 5 | 195 | 202 | -1.02% | 121 | 2 | Town |
Summerville is the largest city in Dorchester County, with a population of 53,623.
Reevesville is the smallest city in Dorchester County, with a population of 195.
There are 5 cities in Dorchester County, South Carolina.