| System Name | Type | City |
|---|---|---|
| Calument Montana Refinery | DMR Motorola Capacity Plus Single Site (TRBO) | Great Falls |
| Harcom Land and Cattle, Inc. | Motorola Type II | Great Falls |
| Montana Public Safety Communications System | Project 25 Phase I | Statewide |
| United States Air Force (157) | Project 25 Phase I | Various |
