| Aberdeen Proving Ground | Project 25 | Phase I | Aberdeen | Harford | 2025-10-08 |
| Anne Arundel County | Project 25 | Phase II | Various | Anne Arundel | 2025-11-18 |
| ARINC (BWI) | iDEN | Standard | BWI Airport | Anne Arundel | 2020-07-01 |
| AstraZeneca - MedImmune | DMR | Motorola Capacity Plus Single Site (TRBO) | Frederick | Frederick | 2025-05-09 |
| Baltimore City | Project 25 | Phase I | Baltimore | Baltimore | 2023-07-11 |
| Baltimore County | Project 25 | Phase I | Various | Baltimore | 2025-02-20 |
| Baltimore County Public Schools | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2023-03-01 |
| Baltimore Gas and Electric | iDEN | Harmony | Various | Multi-County [11] | 2020-04-13 |
| Calvert Cliffs Nuclear Power Plant | DMR | Motorola Capacity Plus Single Site (TRBO) | Lusby | Calvert | 2022-05-31 |
| Calvert County | Project 25 | Phase II | Various | Calvert | 2025-08-20 |
| Calvert County Schools | DMR | Conventional Networked | Various | Calvert | 2021-03-18 |
| Carroll County | Project 25 | Phase II | Westminster | Carroll | 2025-08-01 |
| Casino at Ocean Downs | DMR | Motorola Capacity Plus Single Site (TRBO) | Berlin | Worcester | 2013-12-17 |
| Central Maryland Area Regional Communications Committee (CMARC) | Project 25 | Phase I | Various | Multi-County [6] | 2025-08-13 |
| Champion Communication (Baltimore) | LTR | Standard | Baltimore | Baltimore | 2014-06-09 |
| Champion Communication (Mechanicsville) | LTR | Standard | Mechanicsville | St. Mary's | 2004-07-15 |
| Champion Communication (Upper Marlboro) | LTR | Standard | Upper Marlboro | Prince George's | 2004-07-15 |
| Champion Communication (Waldorf) | LTR | Standard | Waldorf | Charles | 2004-07-15 |
| Charles County | Motorola | Type II Smartnet | Various | Charles | 2022-03-29 |
| Charles County Schools | DMR | Motorola Capacity Plus Single Site (TRBO) | La Plata | Charles | 2020-03-05 |
| Choptank Electric Cooperative | DMR | Motorola Connect Plus (TRBO) | Various | Multi-County [9] | 2023-08-06 |
| Christiana Care Health Services DMR | DMR | Motorola Capacity Plus Multi Site (TRBO) | Multiple | Multi-County [3] | 2025-07-10 |
| Com Pros (Passport) | LTR | Passport | Various | Multi-County [5] | 2025-10-24 |
| Communications Electronics | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2016-08-05 |
| Cove Point Liquid Natural Gas Terminal | DMR | Motorola Capacity Plus Single Site (TRBO) | Lusby | Calvert | 2021-03-25 |
| Department of Homeland Security | Project 25 | Phase I | Various | Multi-County [2] | 2024-03-15 |
| DMR-MARC Amateur Radio Network (MD) | DMR | Conventional Networked | Various | Multi-County [11] | 2023-10-22 |
| Exelon Energy P25 | Project 25 | Phase I | Regional | Multi-County [32] | 2025-06-17 |
| Federal Correctional Institution Cumberland | Motorola | Type II SmartZone | Cumberland | Allegany | 2011-07-26 |
| First Responders Interoperable Radio System Team (FIRST) | Project 25 | Phase II | Various | Multi-County [2] | 2025-11-07 |
| FirstEnergy | Project 25 | Phase I | Various | Multi-County [46] | 2023-08-20 |
| FleetCall | NXDN | NEXEDGE 4800 | Various | Multi-County [16] | 2025-10-15 |
| FleetTalk (DC-Area Connect Plus) | DMR | Motorola Connect Plus (TRBO) | Various | Multi-County [8] | 2023-01-27 |
| FleetTalk (Silver Spring LTR) | LTR | Standard and Passport | Silver Spring | Multi-County [3] | 2020-07-01 |
| Frederick County, MD | Project 25 | Phase I | Frederick | Frederick | 2025-08-20 |
| Garrett County | LTR | Standard | Oakland | Multi-County [4] | 2020-07-01 |
| Gaylord National Resort and Convention Center | DMR | Motorola Capacity Plus Single Site (TRBO) | National Harbor | Prince George's | 2018-11-16 |
| Hollywood Casino Perryville | DMR | Motorola Capacity Plus Single Site (TRBO) | Perryville | Cecil | 2016-05-22 |
| Horseshoe Casino Baltimore | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2016-05-22 |
| Howard Communications (Baltimore NXDN) | NXDN | Icom IDAS Type D | Baltimore | Baltimore | 2020-07-01 |
| Howard Communications (Capacity Plus) | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2022-11-03 |
| Howard Communications (Columbia NXDN) | NXDN | Icom IDAS Type D | Columbia | Howard | 2020-07-01 |
| Howard County General Hospital | DMR | Motorola Capacity Plus Single Site (TRBO) | Columbia | Howard | 2016-07-11 |
| Howard County, MD | Project 25 | Phase I | Various | Howard | 2025-08-23 |
| Integrated Wireless Network (IWN) National Capital Region | Project 25 | Phase I | Various | Multi-County [13] | 2023-05-04 |
| Interstate Repeater System | DMR | Conventional Networked | Various | Multi-County [28] | 2024-11-24 |
| Johns Hopkins Bayview Medical Center | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2023-11-10 |
| Johns Hopkins Hospital | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2020-10-10 |
| Johns Hopkins School of Public Health | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2016-07-21 |
| Joint National Capital Region | Project 25 | Phase II | Various | Multi-County [22] | 2025-10-24 |
| Justice Integrated Wireless Network | Project 25 | Phase II | Various | Multi-County [55] | 2025-06-28 |
| Kroger Customer Fulfillment Center | DMR | Motorola Capacity Plus Single Site (TRBO) | Frederick | Frederick | 2023-04-06 |
| Live! Casino and Hotel | DMR | Motorola Connect Plus (TRBO) | Hanover | Anne Arundel | 2018-04-07 |
| M and D Technical Services | LTR | Standard | Hagerstown | Washington | 2018-07-20 |
| Maryland Aviation Administration | Project 25 | Phase I | BWI Airport | Anne Arundel | 2025-07-04 |
| Maryland Zoo in Baltimore | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2018-10-08 |
| Meritus Medical Center | NXDN | NEXEDGE 4800 | Hagerstown | Washington | 2019-11-01 |
| MGM National Harbor | DMR | Motorola Capacity Plus Single Site (TRBO) | Oxon Hill | Prince George's | 2018-06-05 |
| Mid-Atlantic Digital Radio Network | DMR | Motorola Connect Plus (TRBO) | Various | Multi-County [41] | 2025-10-24 |
| Montgomery County, MD | Project 25 | Phase II | Various | Montgomery | 2025-09-18 |
| Montgomery County, MD Schools | DMR | Motorola Capacity Plus Multi Site (TRBO) | Various | Montgomery | 2023-09-02 |
| NASA Goddard Space Flight Center | Project 25 | Phase II | Various | Multi-County [3] | 2021-05-18 |
| National Aquarium | DMR | Motorola Capacity Plus Single Site (TRBO) | Baltimore | Baltimore | 2016-05-22 |
| National Institutes of Health | Project 25 | Phase II | Various | Multi-County [2] | 2025-06-28 |
| Northwest Stadium | DMR | Motorola Capacity Plus Multi Site (TRBO) | Landover | Prince George's | 2025-09-08 |
| Ocean City | Project 25 | Phase II | Ocean City | Worcester | 2024-05-27 |
| Pine Hill Electronics 1 | LTR | Standard | Towson | Baltimore | 2018-07-20 |
| Pine Hill Electronics 2 | LTR | Standard | Towson | Baltimore | 2018-07-20 |
| Prince George's County | Project 25 | Phase II | Various | Prince George's | 2025-02-11 |
| R and R Communications | LTR | Standard | Clear Spring | Washington | 2018-07-20 |
| R.E. Michel | DMR | Motorola Capacity Plus Single Site (TRBO) | Glen Burnie | Anne Arundel | 2016-11-13 |
| Redi-Call Communications (Salisbury) | LTR | Standard | Salisbury | Wicomico | 2020-08-16 |
| Rockville Public Works | DMR | Motorola Capacity Plus Single Site (TRBO) | Rockville | Montgomery | 2024-01-28 |
| Rocky Gap Casino Resort | NXDN | NEXEDGE 9600 | Flintstone | Allegany | 2025-11-04 |
| Salisbury University | DMR | Motorola Capacity Plus Single Site (TRBO) | Salisbury | Wicomico | 2017-12-29 |
| Somerset County, MD | Project 25 | Phase II | Various | Somerset | 2021-07-11 |
| Southwest Airlines (BWI) | DMR | Motorola Capacity Plus Single Site (TRBO) | BWI Airport | Anne Arundel | 2018-10-08 |
| St. Mary's County | Project 25 | Phase II | Various | St. Mary's | 2024-03-06 |
| Strathmore | LTR | Standard | North Bethesda | Montgomery | 2011-09-04 |
| Teltronic (Princess Anne Capacity Plus) | DMR | Motorola Capacity Plus Single Site (TRBO) | Princess Anne | Somerset | 2021-12-11 |
| Teltronic (Salisbury Capacity Plus) | DMR | Motorola Capacity Plus Single Site (TRBO) | Salisbury | Wicomico | 2021-12-11 |
| Teltronic (Salisbury) | LTR | Standard | Salisbury | Wicomico | 2021-12-11 |
| Teltronic (Whaleyville Capacity Plus) | DMR | Motorola Capacity Plus Single Site (TRBO) | Whaleyville | Worcester | 2016-06-03 |
| Towson University | Motorola | Type II Smartnet | Towson | Baltimore | 2011-07-26 |
| TWR Comms (490 MHz) | LTR | Standard | Frederick | Frederick | 2019-07-26 |
| TWR Comms (Passport) | LTR | Passport | Various | Multi-County [8] | 2017-06-20 |
| Unidentified Federal P25 (680) | Project 25 | Phase I | | Multi-County [4] | 2020-04-14 |
| United States Department of Defense (1B5C8-001) | Project 25 | Phase II | Various | Multi-County [8] | 2023-02-16 |
| University of Maryland Capital Region Medical Center | DMR | Motorola Capacity Plus Single Site (TRBO) | Largo | Prince George's | 2022-04-30 |
| University of Maryland Medical Center | LTR | Standard | Baltimore | Baltimore | 2011-12-12 |
| University of Maryland, Baltimore County | DMR | Motorola Capacity Plus Multi Site (TRBO) | Catonsville | Baltimore | 2023-05-04 |
| University of Maryland, College Park | Motorola | Type II Smartnet | College Park | Prince George's | 2024-06-14 |
| Upper Maryland Eastern Shore Consortium | Motorola | Type II SmartZone | Upper Shore | Queen Anne's | 2020-04-18 |
| Washington County | Project 25 | Phase I | Various | Washington | 2025-04-13 |
| Washington Gas Light Company | Project 25 | Phase II | Various, Multistate | Multi-County [4] | 2025-06-17 |
| Washington Metropolitan Area Transit Authority (P16) | Motorola | Type II SmartZone | Various | Multi-County [10] | 2024-12-09 |
| Washington Metropolitan Area Transit Authority (P25) | Project 25 | Phase II | Various | Multi-County [10] | 2024-03-21 |
| Wicomico County | Project 25 | Phase II | Salisbury | Wicomico | 2024-08-12 |
| Wisp Resort | DMR | Motorola Capacity Plus Single Site (TRBO) | McHenry | Garrett | 2020-12-15 |
| Worcester County | Project 25 | Phase II | Various | Worcester | 2024-08-23 |
