| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Idaho City | city | Idaho | United States | 43.83 | -115.83 | 4189 | |
| Idaho Falls | city | Idaho | United States | 43.47 | -112.03 | 5029 | |
| Idahome | city | Idaho | United States | 42.42 | -113.40 | 4409 | |
| Idmon | city | Idaho | United States | 44.36 | -111.91 | 6709 | |
| Ilo (historical) | city | Idaho | United States | 46.24 | -116.50 | 4189 | |
| Independence (historical) | city | Idaho | United States | 43.78 | -111.92 | 5029 | |
| Indian Head Rock | city | Idaho | United States | 43.56 | -114.80 | 6709 | |
| Indian Jim Place | city | Idaho | United States | 42.17 | -114.91 | 5869 | |
| Indian Valley | city | Idaho | United States | 44.56 | -116.43 | 3349 | |
| Ingard | city | Idaho | United States | 44.03 | -116.92 | 2509 | |
| Inkom | city | Idaho | United States | 42.80 | -112.25 | 4599 | |
| Iona | city | Idaho | United States | 43.53 | -111.93 | 5029 | |
| Ireland Springs | city | Idaho | United States | 42.16 | -112.50 | 5374 | |
| Irwin | city | Idaho | United States | 43.41 | -111.30 | 5380 | |
| Isabella Landing | city | Idaho | United States | 46.85 | -115.63 | 1801 | |
| Island Park | city | Idaho | United States | 44.42 | -111.37 | 6249 | |
| Iversons | city | Idaho | United States | 42.30 | -114.01 | 5029 |