| Worcester City Police | Worcester | Public Safety | 102 |
| New Bedford Police, Fire and EMS | Bristol | Public Safety | 94 |
| Fall River Police and Fire | Bristol | Public Safety | 86 |
| Lowell Police Department | Middlesex | Public Safety | 54 |
| Eastern Massachusetts State Police | Essex | Public Safety | 48 |
| Martha's Vineyard Public Safety | Dukes | Public Safety | 32 |
| Berkshire County Fire, Police and EMS - Central-Northern | Berkshire | Public Safety | 29 |
| Franklin County Police, Fire and EMS Dispatch | Franklin | Public Safety | 27 |
| Quincy Police & Fire Dispatch | Norfolk | Public Safety | 24 |
| Weymouth Police and Fire Dispatch | Norfolk | Public Safety | 22 |
| North Adams Police / Fire, Adams, Williamstown and County Police | Berkshire | Public Safety | 21 |
| Peabody Police and Fire | Essex | Public Safety | 20 |
| Massachusetts State Police Dispatch - Troop B | Berkshire | Public Safety | 18 |
| Haverhill Fire | Essex | Public Safety | 18 |
| Waltham Police & Fire | Middlesex | Public Safety | 13 |
| Greenfield Police & Fire Dispatch | Franklin | Public Safety | 13 |
| Falmouth Police | Barnstable | Public Safety | 12 |
| Boston Fire Department | Suffolk | Public Safety | 11 |
| Gardner Police | Worcester | Public Safety | 10 |
| Taunton Fire | Bristol | Public Safety | 10 |
| Barnstable, Dukes, Nantucket and Plymouth Counties Fire Departments | Barnstable | Public Safety | 9 |
| South Worcester County Communications Center | Worcester | Public Safety | 9 |
| Spencer Area Police, Fire and EMS | Worcester | Public Safety | 9 |
| Revere Police | Suffolk | Public Safety | 9 |
| Plymouth County Police, Fire and EMS | Plymouth | Public Safety | 9 |
| Norfolk County Fire Control | Norfolk | Public Safety | 9 |
| Springfield Fire Dept | Hampden | Public Safety | 9 |
| Lynn Fire Department | Essex | Public Safety | 9 |
| Fitchburg Police and Fire Dispatch | Worcester | Public Safety | 8 |
| Southbridge Police Dispatch | Worcester | Public Safety | 8 |
| Webster Police | Worcester | Public Safety | 8 |
| Essex and Southern Rockingham Counties Fire / EMS | Essex | Public Safety | 8 |
| Clinton Public Safety | Worcester | Public Safety | 7 |
| Leominster Police and Fire Dispatch | Worcester | Public Safety | 7 |
| Carver Fire, Police, and EMS, Plymouth Fire/EMS, Wareham and Plympton Fire | Plymouth | Public Safety | 7 |
| Attleboro Police and Fire | Bristol | Public Safety | 7 |
| Gloucester Police Dispatch | Essex | Public Safety | 7 |
| Worcester City Fire and EMS | Worcester | Public Safety | 6 |
| Boston EMS | Suffolk | Public Safety | 6 |
| Marlborough Police and Fire | Middlesex | Public Safety | 6 |
| Cape Wide Public Safety | Barnstable | Public Safety | 5 |
| Southern Berkshire County Police, Fire and EMS | Berkshire | Public Safety | 5 |
| Franklin Police and Fire | Norfolk | Public Safety | 5 |
| Westcomm Regional Public Safety | Hampden | Public Safety | 5 |
| South Worcester County Law Dispatch, Oxford, Charlton, Webster, Dudley | Worcester | Public Safety | 4 |
| Oxford & Charlton Police and Fire | Worcester | Public Safety | 4 |
| Mendon Fire | Worcester | Public Safety | 4 |
| Fitchburg and Lunenburg Fire and Mid State Control | Worcester | Public Safety | 4 |
| Brockton Fire | Plymouth | Public Safety | 4 |
| Sharon and Foxboro Police/Fire, State Police Dispatch Troop H3 | Norfolk | Public Safety | 4 |
| Bellingham Police, Fire and EMS Dispatch | Norfolk | Public Safety | 4 |
| South Coast Massachusetts Public Safety | Bristol | Public Safety | 4 |
| Melrose Fire Dispatch | Middlesex | Public Safety | 4 |
| Tewksbury Police and Fire | Middlesex | Public Safety | 4 |
| Lowell Fire Department | Middlesex | Public Safety | 4 |
| North Attleboro Fire 1 | Bristol | Public Safety | 4 |
| Newton Police and Fire | Middlesex | Public Safety | 4 |
| Billerica Police and Fire | Middlesex | Public Safety | 4 |
| Hampden County Fire Departments | Hampden | Public Safety | 4 |
| Westford Police | Middlesex | Public Safety | 3 |
| Southbridge Police and Fire | Worcester | Public Safety | 3 |
| Gardner Fire | Worcester | Public Safety | 3 |
| Chelsea Fire Channel 1 | Suffolk | Public Safety | 3 |
| Nantucket Fire | Nantucket | Public Safety | 3 |
| Cambridge Fire | Middlesex | Public Safety | 3 |
| Cambridge Police | Middlesex | Public Safety | 3 |
| Westcomm Regional - Fire | Hampden | Public Safety | 3 |
| Franklin County Fire and EMS | Franklin | Public Safety | 3 |
| Marblehead Police & Fire | Essex | Public Safety | 3 |
| Merrimack Valley Police, Fire and EMS | Essex | Public Safety | 3 |
| Danvers Police | Essex | Public Safety | 3 |
| Middlesex and Essex Counties Fire | Essex | Public Safety | 3 |
| Mansfield Fire | Bristol | Public Safety | 3 |
| Falmouth Fire Rescue Dept | Barnstable | Public Safety | 3 |
| Bourne Fire | Barnstable | Public Safety | 3 |
| Wrentham Police Dispatch | Norfolk | Public Safety | 2 |
| Ware Public Safety | Hampshire | Public Safety | 2 |
| Concord Fire | Middlesex | Public Safety | 2 |
| Hopkinton Fire | Middlesex | Public Safety | 2 |
| Tyngsborough Police and Fire Dispatch | Middlesex | Public Safety | 2 |
| Weston Fire | Middlesex | Public Safety | 2 |
| North Reading Police Dispatch | Middlesex | Public Safety | 2 |
| Chelmsford Police and Fire | Middlesex | Public Safety | 2 |
| Pepperell Fire and EMS | Middlesex | Public Safety | 2 |
| MA State Police Bristol/Plymouth Counties Simulcast | Bristol | Public Safety | 2 |
| Framingham Fire - Fire Ops | Middlesex | Public Safety | 2 |
| Somerville Fire Department | Middlesex | Public Safety | 2 |
| Bedford Police | Middlesex | Public Safety | 2 |
| Maynard Fire Department | Middlesex | Public Safety | 2 |
| Boylston Area Fire | Worcester | Public Safety | 2 |
| Sutton Police Department | Worcester | Public Safety | 2 |
| Clinton Fire | Worcester | Public Safety | 2 |
| Webster Fire and EMS | Worcester | Public Safety | 2 |
| Athol Fire | Worcester | Public Safety | 2 |
| Southbridge and Area Fire Departments | Worcester | Public Safety | 2 |
| Lancaster Police and Fire | Worcester | Public Safety | 2 |
| Winthrop Police | Suffolk | Public Safety | 2 |
| Revere Fire | Suffolk | Public Safety | 2 |
| MetroFire Mutual Aid | Suffolk | Public Safety | 2 |
| TAC9 Public Safety Notification System | Statewide | Other | 2 |