9 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Kyle | Oglala Lakota County | 1,645 |
| Kimball | Brule County | 575 |
| Kadoka | Jackson County | 523 |
| Kennebec | Lyman County | 288 |
| Keystone | Pennington County | 269 |
| Kranzburg | Codington County | 167 |
| Kenel | Sioux County | 153 |
| Kaylor | Hutchinson County | 84 |
| Kidder | Sargent County | 12 |