9 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kyle | Oglala Lakota County | 1,668 |
| Kimball | Brule County | 588 |
| Kadoka | Jackson County | 535 |
| Kennebec | Lyman County | 288 |
| Keystone | Pennington County | 239 |
| Kenel | Sioux County | 220 |
| Kranzburg | Codington County | 167 |
| Kaylor | Hutchinson County | 19 |
| Kidder | Sargent County | 14 |