33 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Lakewood | Arapahoe County | 157,161 |
| Longmont | Boulder County | 100,124 |
| Loveland | Larimer County | 83,465 |
| Littleton | Arapahoe County | 44,519 |
| Lafayette | Boulder County | 30,679 |
| Louisville | Boulder County | 20,614 |
| Lone Tree | Arapahoe County | 13,982 |
| Lochbuie | Adams County | 8,792 |
| Lamar | Prowers County | 7,610 |
| La Junta | Otero County | 6,820 |
| Lincoln Park | Fremont County | 4,492 |
| Leadville | Lake County | 2,625 |
| Las Animas | Bent County | 2,393 |
| La Salle | Weld County | 2,274 |
| Lyons | Boulder County | 2,130 |
| Laporte | Larimer County | 2,048 |
| Limon | Lincoln County | 1,970 |
| Leadville North | Lake County | 1,395 |
| Loma | Mesa County | 1,382 |
| Lazy Acres | Boulder County | 1,087 |
| Log Lane Village | Morgan County | 956 |
| La Veta | Huerfano County | 874 |
| Loghill Village | Ouray County | 698 |
| La Jara | Conejos County | 697 |
| Lake City | Hinsdale County | 401 |
| Lewis | Montezuma County | 360 |
| Louviers | Douglas County | 275 |
| Larkspur | Douglas County | 230 |
| Lazear | Delta County | 202 |
| La Junta Gardens | Bent County | 115 |
| Lakeside | Adams County | 14 |
| Lynn | Las Animas County | 7 |
| Laird | Yuma County | 6 |