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South Dakota Area Codes
South Dakota has 1 area code in service: 605.
Largest cities
| City | Area codes |
|---|---|
| Sioux Falls | 605 |
| Rapid City | 605 |
| Aberdeen | 605 |
| Brookings | 605 |
| Watertown | 605 |
| Yankton | 605 |
| Mitchell | 605 |
| Huron | 605 |
| Spearfish | 605 |
| Box Elder | 605 |
| Pierre | 605 |
| Vermillion | 605 |
All area codes in South Dakota
| Code | Main cities | Overlay | In service since | Projected exhaust |
|---|---|---|---|---|
| 605 | Sioux Falls, Rapid City, Aberdeen, Brookings | — | 1947 | 2034 |
745 prefixes are in use across South Dakota. Exhaust years are NANPA's 2026 forecast.