| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| I-94 Trailer Park | city | Montana | United States | 47.105 | -104.73167 | 2053 | 3658 |
| Idlewile historical | city | Montana | United States | 48.04417 | -106.42972 | 2037 | 20 |
| Idlewise Court | city | Montana | United States | 48.02278 | -114.06667 | 3156 | 1067 |
| Iliad | city | Montana | United States | 47.79861 | -109.78528 | 2969 | 42 |
| Independence | city | Montana | United States | 45.2125 | -110.24556 | 8494 | 123 |
| Indian Arrow | city | Montana | United States | 45.78361 | -108.17417 | 3802 | 266 |
| Inga historical | city | Montana | United States | 48.10417 | -110.33056 | 2926 | 42 |
| Ingomar | city | Montana | United States | 46.57667 | -107.37167 | 2998 | 5 |
| Intake | city | Montana | United States | 47.29389 | -104.52139 | 2043 | 31 |
| Inverness | city | Montana | United States | 48.55667 | -110.68333 | 3202 | 42 |
| Iris | city | Montana | United States | 46.72556 | -113.63639 | 3599 | 365 |
| Iron | city | Montana | United States | 46.68667 | -112.05972 | 3792 | 6424 |
| Iron Rod historical | city | Montana | United States | 45.64361 | -112.30833 | 4563 | 103 |
| Island City historical | city | Montana | United States | 47.36111 | -114.78889 | 2598 | 131 |
| Ismay | city | Montana | United States | 46.49722 | -104.79361 | 2568 | 47 |
| Iverness | city | Montana | United States | 48.55639 | -110.68833 | 3218 | 42 |
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