| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Idaho Creek | city | Colorado | United States | 40.12 | -105.01 | 5029 | |
| Idaho Springs | city | Colorado | United States | 39.74 | -105.51 | 7782 | |
| Idalia | city | Colorado | United States | 39.70 | -102.29 | 4189 | |
| Idledale | city | Colorado | United States | 39.67 | -105.24 | 6709 | |
| Idylwilde | city | Colorado | United States | 40.70 | -105.65 | 8389 | |
| Ignacio | city | Colorado | United States | 37.12 | -107.63 | 6709 | |
| Iles Grove | city | Colorado | United States | 40.34 | -107.69 | 6709 | |
| Iliff | city | Colorado | United States | 40.76 | -103.07 | 4189 | |
| Ilium | city | Colorado | United States | 37.93 | -107.90 | 8540 | |
| Independence (historical) | city | Colorado | United States | 39.11 | -106.61 | 11017 | |
| Independence (historical) | city | Colorado | United States | 38.73 | -105.14 | 10334 | |
| Indian Hills | city | Colorado | United States | 39.62 | -105.24 | 7030 | |
| Indian Meadows | city | Colorado | United States | 40.70 | -105.55 | 7001 | |
| Indian Springs Village | city | Colorado | United States | 39.43 | -105.32 | 7549 | |
| Indians Hills | city | Colorado | United States | 39.63 | -105.26 | 7549 | |
| Insmont | city | Colorado | United States | 39.39 | -105.45 | 7765 | |
| Inverness | city | Colorado | United States | 39.58 | -104.86 | 5869 | |
| Inverness | city | Colorado | United States | 39.56 | -104.86 | 5889 | |
| Iola (historical) | city | Colorado | United States | 38.47 | -107.10 | 7598 | |
| Iris | city | Colorado | United States | 38.42 | -106.83 | 9228 | |
| Iron City (historical) | city | Colorado | United States | 38.71 | -106.34 | 10068 | |
| Irondale | city | Colorado | United States | 39.85 | -104.90 | 5134 | |
| Ironton | city | Colorado | United States | 37.93 | -107.68 | 10068 | |
| Irwin | city | Colorado | United States | 38.87 | -107.10 | 10196 | |
| Ivywild | city | Colorado | United States | 38.81 | -104.84 | 5997 |