| System Name | Type | City |
|---|---|---|
| Aberdeen Proving Ground | Project 25 Phase I | Aberdeen |
| Baltimore Gas and Electric | iDEN Harmony | Various |
| 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 |
| FleetCall | NXDN NEXEDGE 4800 | Various |
| Interstate Repeater System | DMR Conventional Networked | Various |
