| System Name | Type | City |
|---|---|---|
| Baltimore Gas and Electric | iDEN Harmony | Various |
| Carroll County | Project 25 Phase II | Westminster |
| Central Maryland Area Regional Communications Committee (CMARC) | Project 25 Phase I | Various |
| Exelon Energy P25 | Project 25 Phase I | Regional |
| First Responders Interoperable Radio System Team (FIRST) | Project 25 Phase II | Various |
| United States Department of Defense (1B5C8-001) | Project 25 Phase II | Various |
