14 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Thornton | Adams County | 147,813 |
| The Pinery | Douglas County | 11,928 |
| Timnath | Larimer County | 11,873 |
| Twin Lakes | Lake County | 8,614 |
| Trinidad | Las Animas County | 8,144 |
| Todd Creek | Adams County | 5,269 |
| Telluride | San Miguel County | 2,451 |
| Towaoc | Montezuma County | 1,054 |
| Tabernash | Grand County | 855 |
| Twin Lakes | Lake County | 555 |
| Tall Timber | Boulder County | 402 |
| Trail Side | Adams County | 98 |
| Two Buttes | Baca County | 31 |
| Towner | Kiowa County | 27 |