| Baltimore County Municipal Police Departments | Baltimore | Public Safety | 109 |
| Baltimore City Police | Baltimore | Public Safety | 87 |
| Howard County Police, Fire and EMS | Howard | Public Safety | 53 |
| Frederick County Sheriff, Fire and EMS, State Police | Frederick | Public Safety | 52 |
| Carroll County Fire and EMS - Digital | Carroll | Public Safety | 45 |
| Anne Arundel County Fire and EMS | Anne Arundel | Public Safety | 44 |
| Harford County Fire and EMS | Harford | Public Safety | 40 |
| Calvert County Fire, EMS, and Sheriff | Calvert | Public Safety | 37 |
| Baltimore City Fire | Baltimore | Public Safety | 29 |
| Allegany County Emergency Services | Allegany | Public Safety | 27 |
| Cecil County Fire and EMS | Cecil | Public Safety | 23 |
| Washington County Fire and EMS - Digital | Washington | Public Safety | 22 |
| Charles County Law Enforcement | Charles | Public Safety | 21 |
| Queen Anne's County Fire, EMS and Police | Queen Anne's | Public Safety | 20 |
| St. Mary's County Fire and EMS | St. Mary's | Public Safety | 18 |
| Charles County Fire & EMS | Charles | Public Safety | 17 |
| Garrett County Public Safety | Garrett | Public Safety | 17 |
| Baltimore County Fire and EMS - Digital | Baltimore | Public Safety | 17 |
| Carroll County Law Enforcement | Carroll | Public Safety | 16 |
| Caroline, Queen Anne's, and Talbot Counties Fire | Caroline | Public Safety | 15 |
| Caroline County Fire and EMS | Caroline | Public Safety | 13 |
| Worcester County / Ocean City Fire | Worcester | Public Safety | 12 |
| Wicomico County Fire and EMS | Wicomico | Public Safety | 12 |
| Prince George's County Fire and EMS | Prince George's | Public Safety | 11 |
| Kent County Fire Dispatch | Kent | Public Safety | 10 |
| Ocean City Fire Department | Worcester | Public Safety | 9 |
| Worcester County Fire and EMS, State Police and Highway | Worcester | Public Safety | 9 |
| Baltimore City Police Southern District | Baltimore | Public Safety | 8 |
| Baltimore City Police Northeast District | Baltimore | Public Safety | 7 |
| Baltimore City Police Southeast District | Baltimore | Public Safety | 6 |
| Garrett County Public Safety | Garrett | Public Safety | 6 |
| St. Mary's County Public Safety | St. Mary's | Public Safety | 4 |
| Baltimore City Police Southwest District | Baltimore | Public Safety | 3 |
| Baltimore City Police Western District | Baltimore | Public Safety | 3 |
| Calvert County Fire & EMS | Calvert | Public Safety | 3 |
| NOAA Weather Radio Sudlersville (WXK97) | Anne Arundel | Other | 2 |
| Howard County Fire Dispatch | Howard | Public Safety | 2 |
| Montgomery County MD Fire Rescue 7A2 Dispatch | Montgomery | Public Safety | 2 |
| Baltimore City Police Northern District | Baltimore | Public Safety | 2 |
| Baltimore City Police Central District | Baltimore | Public Safety | 2 |
| Baltimore City Police Eastern District | Baltimore | Public Safety | 2 |
| Frederick County Sheriff - FCSO Dispatch 1 | Frederick | Public Safety | 2 |
| Baltimore City Police Northwest District | Baltimore | Public Safety | 2 |
| Air Traffic Control For Areas Of Md/Pa | Baltimore | Aviation | 1 |
| Harford County Fire and EMS Working Incidents | Harford | Public Safety | 1 |
| Frederick County Fire - 9A DISP | Frederick | Public Safety | 1 |
| Frederick County Fire - Digital | Frederick | Public Safety | 1 |
| Joint Base Andrews ATC | Prince George's | Aviation | 1 |
| Montgomery County MD Fire Rescue 7A1 Ops 1 | Montgomery | Public Safety | 1 |
| NOAA Weather Radio DC (WNG736) | Anne Arundel | Other | 1 |
| NOAA Weather Radio Baltimore (KEC83) | Baltimore | Other | 1 |
| CHART District 7 | Statewide | Public Safety | 0 |
| Anne Arundel Radio Club | Anne Arundel | Amateur Radio | 0 |
| Baltimore Harbor Marine VHF | Baltimore | Marine | 0 |
| Talbot County Fire and EMS | Talbot | Public Safety | 0 |
| Maryland State Police Barracks I | Talbot | Public Safety | 0 |
| N3ST Repeater System | Anne Arundel | Amateur Radio | 0 |
| Ocean City Beach Patrol | Worcester | Public Safety | 0 |
| Frederick County Fire - 9H CMD 13 | Frederick | Public Safety | 0 |
| N3KZS 146.8950 MHz Repeater Link System | Carroll | Amateur Radio | 0 |
| NOAA Weather Radio Manassas (KHB96) | Calvert | Other | 0 |
| Norfolk Southern Railroad | Cecil | Rail | 0 |
| Dorchester County Fire and EMS | Dorchester | Public Safety | 0 |
| Baltimore Rails East | Baltimore | Rail | 0 |
| W3FDK 146.7300 MHz Frederick Repeater | Frederick | Amateur Radio | 0 |
| Frederick County Airport (KFDK) | Frederick | Aviation | 0 |
| Frederick County Fire - 9D TAC 10 | Frederick | Public Safety | 0 |
| Frederick County Fire - 9C FIRE 1 | Frederick | Public Safety | 0 |
| Frederick County Fire - 9B EMS 1 | Frederick | Public Safety | 0 |
| Frederick County Fire - 9-I TAC 20 | Frederick | Public Safety | 0 |
| Allstar Node 571170 | Montgomery | Amateur Radio | 0 |
| Frederick County Fire - 9J TAC 21 | Frederick | Public Safety | 0 |
| Frederick County Fire Police (92H) | Frederick | Public Safety | 0 |
| Baltimore Terminal Rail | Baltimore | Rail | 0 |
| Harford County Public Safety | Harford | Public Safety | 0 |
| Harford County Fire - C6 & D6 Working Incidents | Harford | Public Safety | 0 |
| Harford County Fire - B6 & E6 Working Incidents | Harford | Public Safety | 0 |
| W3FT 146.670 BARC in Towson, Maryland | Baltimore | Amateur Radio | 0 |
| Montgomery County MD Fire Rescue 7A3 Ops 3 | Montgomery | Public Safety | 0 |
| Montgomery County MD Fire Rescue 7A4 Incident 10 | Montgomery | Public Safety | 0 |
| Allstar Node 571171 | Montgomery | Amateur Radio | 0 |