18 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Rifle | Garfield County | 10,773 |
| Roxborough Park | Douglas County | 9,426 |
| Redlands | Mesa County | 8,791 |
| Rocky Ford | Otero County | 3,739 |
| Rangely | Rio Blanco County | 2,283 |
| Ridgway | Ouray County | 1,331 |
| Rockvale | Fremont County | 543 |
| Redvale | Montrose County | 444 |
| Rico | Dolores County | 357 |
| Red Feather Lakes | Larimer County | 348 |
| Rollinsville | Gilpin County | 320 |
| Romeo | Conejos County | 315 |
| Red Cliff | Eagle County | 231 |
| Rye | Pueblo County | 201 |
| Redstone | Eagle County | 163 |
| Rock Creek Park | El Paso County | 155 |
| Raymer (New Raymer) | Morgan County | 111 |
| Ramah | El Paso County | 103 |