| Worcester City Police | Worcester | Public Safety | 68 |
| New Bedford Police, Fire and EMS | Bristol | Public Safety | 55 |
| Fall River Police and Fire | Bristol | Public Safety | 44 |
| Berkshire County Fire, Police and EMS - Central-Northern | Berkshire | Public Safety | 33 |
| North Adams Police / Fire, Adams, Williamstown and County Police | Berkshire | Public Safety | 31 |
| Eastern Massachusetts State Police | Essex | Public Safety | 30 |
| Franklin County Police, Fire and EMS Dispatch | Franklin | Public Safety | 27 |
| Lowell Police Department | Middlesex | Public Safety | 26 |
| Martha's Vineyard Public Safety | Dukes | Public Safety | 26 |
| Quincy Police & Fire Dispatch | Norfolk | Public Safety | 24 |
| Peabody Police and Fire | Essex | Public Safety | 24 |
| Massachusetts State Police Dispatch - Troop B | Berkshire | Public Safety | 19 |
| Chelmsford Police and Fire | Middlesex | Public Safety | 18 |
| Haverhill Fire | Essex | Public Safety | 18 |
| Worcester City Fire and EMS | Worcester | Public Safety | 17 |
| South Worcester County Communications Center | Worcester | Public Safety | 16 |
| Weymouth Police and Fire Dispatch | Norfolk | Public Safety | 15 |
| Fitchburg Police and Fire Dispatch | Worcester | Public Safety | 14 |
| Boston Fire Department | Suffolk | Public Safety | 14 |
| Taunton Fire | Bristol | Public Safety | 14 |
| Greenfield Police & Fire Dispatch | Franklin | Public Safety | 13 |
| Clinton Public Safety | Worcester | Public Safety | 13 |
| Waltham Police & Fire | Middlesex | Public Safety | 12 |
| Revere Police | Suffolk | Public Safety | 12 |
| Brockton Fire | Plymouth | Public Safety | 11 |
| Essex and Southern Rockingham Counties Fire / EMS | Essex | Public Safety | 11 |
| Leominster Police and Fire Dispatch | Worcester | Public Safety | 11 |
| Falmouth Police | Barnstable | Public Safety | 10 |
| Franklin Police and Fire | Norfolk | Public Safety | 10 |
| Gloucester Police Dispatch | Essex | Public Safety | 9 |
| Barnstable, Dukes, Nantucket and Plymouth Counties Fire Departments | Barnstable | Public Safety | 9 |
| Billerica Police and Fire | Middlesex | Public Safety | 8 |
| Lynn Fire Department | Essex | Public Safety | 8 |
| Norfolk County Fire Control | Norfolk | Public Safety | 8 |
| Southern Berkshire County Police, Fire and EMS | Berkshire | Public Safety | 7 |
| South Coast Massachusetts Public Safety | Bristol | Public Safety | 7 |
| Attleboro Police and Fire | Bristol | Public Safety | 7 |
| Webster Police | Worcester | Public Safety | 7 |
| Southbridge Police Dispatch | Worcester | Public Safety | 7 |
| Gardner Fire | Worcester | Public Safety | 6 |
| Fitchburg and Lunenburg Fire and Mid State Control | Worcester | Public Safety | 6 |
| Boston EMS | Suffolk | Public Safety | 6 |
| Cambridge Police | Middlesex | Public Safety | 6 |
| Marlborough Police and Fire | Middlesex | Public Safety | 6 |
| Mansfield Fire | Bristol | Public Safety | 5 |
| Gardner Police | Worcester | Public Safety | 5 |
| Plymouth County Police, Fire and EMS | Plymouth | Public Safety | 5 |
| Franklin County Fire and EMS | Franklin | Public Safety | 5 |
| Sharon and Foxboro Police/Fire, State Police Dispatch Troop H3 | Norfolk | Public Safety | 5 |
| Uxbridge Police Department | Worcester | Public Safety | 5 |
| Southbridge Police and Fire | Worcester | Public Safety | 5 |
| Falmouth Fire Rescue Dept | Barnstable | Public Safety | 4 |
| Lawrence Fire | Essex | Public Safety | 4 |
| Plymouth County Fire Mutual Aid | Plymouth | Public Safety | 4 |
| Carver Fire, Police, and EMS, Plymouth Fire/EMS, Wareham and Plympton Fire | Plymouth | Public Safety | 4 |
| South Worcester County Law Dispatch, Oxford, Charlton, Webster, Dudley | Worcester | Public Safety | 4 |
| Bourne Fire | Barnstable | Public Safety | 4 |
| Westport Fire | Bristol | Public Safety | 3 |
| Rehoboth Police and Fire | Bristol | Public Safety | 3 |
| New Bedford Fire | Bristol | Public Safety | 3 |
| Tyngsborough Police and Fire Dispatch | Middlesex | Public Safety | 3 |
| Ware Public Safety | Hampshire | Public Safety | 3 |
| Cape Wide Public Safety | Barnstable | Public Safety | 3 |
| Freetown Police & Fire | Bristol | Public Safety | 3 |
| Boylston Area Fire | Worcester | Public Safety | 3 |
| Chelsea Fire Channel 1 | Suffolk | Public Safety | 3 |
| MetroFire Mutual Aid | Suffolk | Public Safety | 3 |
| Mendon Fire | Worcester | Public Safety | 3 |
| Revere Fire | Suffolk | Public Safety | 3 |
| Newton Police and Fire | Middlesex | Public Safety | 3 |
| Kingston Fire and EMS Dispatch | Plymouth | Public Safety | 3 |
| Middlesex and Essex Counties Fire | Essex | Public Safety | 3 |
| Westcomm Regional - Fire | Hampden | Public Safety | 3 |
| Wrentham Fire | Norfolk | Public Safety | 3 |
| Winchendon Fire | Worcester | Public Safety | 3 |
| Saugus Police and Fire | Essex | Public Safety | 3 |
| Gloucester Fire | Essex | Public Safety | 3 |
| Greenfield Fire | Franklin | Public Safety | 3 |
| Walpole Fire | Norfolk | Public Safety | 3 |
| Bellingham Police, Fire and EMS Dispatch | Norfolk | Public Safety | 3 |
| Hampden County Fire Departments | Hampden | Public Safety | 3 |
| Maynard Fire Department | Middlesex | Public Safety | 3 |
| Tewksbury Police and Fire | Middlesex | Public Safety | 3 |
| Concord Fire | Middlesex | Public Safety | 2 |
| Hopkinton Police, Fire and DPW | Middlesex | Public Safety | 2 |
| North Reading Police Dispatch | Middlesex | Public Safety | 2 |
| TAC9 Public Safety Notification System | Statewide | Other | 2 |
| Cambridge Fire | Middlesex | Public Safety | 2 |
| Athol Police Department | Worcester | Public Safety | 2 |
| Framingham Fire - Fire Ops | Middlesex | Public Safety | 2 |
| Somerville Fire Department | Middlesex | Public Safety | 2 |
| MIT Police and EMS | Middlesex | Public Safety | 2 |
| Townsend Fire Dispatch | Middlesex | Public Safety | 2 |
| Lowell Fire Department | Middlesex | Public Safety | 2 |
| Athol Fire | Worcester | Public Safety | 2 |
| Clinton Fire | Worcester | Public Safety | 2 |
| Webster Fire and EMS | Worcester | Public Safety | 2 |
| Winthrop Police | Suffolk | Public Safety | 2 |
| MBTA Transit Police | Suffolk | Public Safety | 2 |
| Southbridge and Area Fire Departments | Worcester | Public Safety | 2 |