| City | County | 2026 Pop. ↓ |
|---|---|---|
| Lakewood | Arapahoe County | 157,210 |
| Longmont | Boulder County | 100,211 |
| Loveland | Larimer County | 82,545 |
| Littleton | Arapahoe County | 46,208 |
| Lafayette | Boulder County | 30,150 |
| Louisville | Boulder County | 20,468 |
| Lone Tree | Arapahoe County | 15,231 |
| Lochbuie | Adams County | 8,880 |
| Lamar | Prowers County | 7,566 |
| La Junta | Otero County | 6,771 |
| Lincoln Park | Fremont County | 4,492 |
| Leadville | Lake County | 2,677 |
| Las Animas | Bent County | 2,338 |
| La Salle | Weld County | 2,292 |
| Lyons | Boulder County | 2,105 |
| Laporte | Larimer County | 2,048 |
| Limon | Lincoln County | 2,010 |
| Leadville North | Lake County | 1,395 |
| Loma | Mesa County | 1,382 |
| Lazy Acres | Boulder County | 1,087 |
| Log Lane Village | Morgan County | 948 |
| La Veta | Huerfano County | 861 |
| La Jara | Conejos County | 703 |
| Loghill Village | Ouray County | 698 |
| Lake City | Hinsdale County | 410 |
| Lewis | Montezuma County | 360 |
| Louviers | Douglas County | 275 |
| Larkspur | Douglas County | 222 |
| Lazear | Delta County | 202 |
| La Junta Gardens | Bent County | 115 |
| Lakeside | Adams County | 15 |
| Lynn | Las Animas County | 7 |
| Laird | Yuma County | 6 |