14 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Dillon | Beaverhead County | 4,422 |
| Deer Lodge | Powell County | 2,998 |
| Darby | Ravalli County | 912 |
| Dutton | Teton County | 318 |
| Drummond | Granite County | 305 |
| Denton | Fergus County | 215 |
| Dupuyer | Pondera County | 161 |
| Dayton | Lake County | 127 |
| Dodson | Phillips County | 126 |
| De Borgia | Mineral County | 44 |
| Dell | Beaverhead County | 41 |
| Dewey | Beaverhead County | 33 |
| Deerfield Colony | Fergus County | 25 |
| Danvers | Fergus County | 7 |