33 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Lakewood | Arapahoe County | 155,770 |
| Longmont | Boulder County | 98,258 |
| Loveland | Larimer County | 81,342 |
| Littleton | Arapahoe County | 43,688 |
| Lafayette | Boulder County | 30,443 |
| Louisville | Boulder County | 19,867 |
| Lone Tree | Arapahoe County | 13,918 |
| Lochbuie | Adams County | 8,425 |
| Lamar | Prowers County | 7,409 |
| La Junta | Otero County | 6,845 |
| Lincoln Park | Fremont County | 4,630 |
| Leadville | Lake County | 2,631 |
| Las Animas | Bent County | 2,424 |
| La Salle | Weld County | 2,263 |
| Laporte | Larimer County | 2,179 |
| Lyons | Boulder County | 2,113 |
| Leadville North | Lake County | 2,055 |
| Limon | Lincoln County | 1,981 |
| Loma | Mesa County | 1,528 |
| Lazy Acres | Boulder County | 1,038 |
| Log Lane Village | Morgan County | 902 |
| La Veta | Huerfano County | 891 |
| Loghill Village | Ouray County | 711 |
| La Jara | Conejos County | 708 |
| Lake City | Hinsdale County | 417 |
| Louviers | Douglas County | 265 |
| Larkspur | Douglas County | 226 |
| Lazear | Delta County | 178 |
| La Junta Gardens | Bent County | 127 |
| Lewis | Montezuma County | 111 |
| Lakeside | Adams County | 15 |
| Lynn | Las Animas County | 13 |
| Laird | Yuma County | 6 |