7 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 57625 | Eagle Butte | 3,906 |
| 57601 | Mobridge | 3,514 |
| 57656 | Timber Lake | 842 |
| 57652 | Ridgeview | 409 |
| 57661 | Whitehorse | 183 |
| 57636 | Lantry | 77 |
| 57630 | Glencross | 31 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Dewey County, South Dakota (US Census).