14 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Thornton | Adams County | 148,938 |
| Timnath | Larimer County | 12,899 |
| The Pinery | Douglas County | 12,022 |
| Twin Lakes | Lake County | 8,782 |
| Trinidad | Las Animas County | 8,105 |
| Todd Creek | Adams County | 5,369 |
| Telluride | San Miguel County | 2,417 |
| Towaoc | Montezuma County | 1,051 |
| Tabernash | Grand County | 885 |
| Twin Lakes | Lake County | 581 |
| Tall Timber | Boulder County | 415 |
| Trail Side | Adams County | 105 |
| Two Buttes | Baca County | 31 |
| Towner | Kiowa County | 28 |