8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 29485 | Summerville | 58,670 |
| 29483 | Summerville | 56,979 |
| 29420 | North Charleston | 23,311 |
| 29472 | Ridgeville | 11,531 |
| 29477 | Saint George | 6,949 |
| 29437 | Dorchester | 2,287 |
| 29448 | Harleyville | 2,224 |
| 29471 | Reevesville | 1,332 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Dorchester County, South Carolina (US Census).