| EMS & OPP (Ottawa & Region) | Ottawa | Public Safety | 49 |
| Temiskaming District Ontario Police, Fire and EMS | Timiskaming District | Public Safety | 49 |
| Prince Edward County Public Safety | Prince Edward | Public Safety | 45 |
| London Fire and Public Works | Middlesex | Public Safety | 31 |
| Hastings OPP | Hastings | Public Safety | 18 |
| Niagara Regional Public Safety | Niagara | Public Safety | 16 |
| Peterborough, Kawartha Lakes and Northumberland Police, Fire and EMS | Peterborough | Public Safety | 15 |
| Nipissing District Public Safety | Nipissing District | Public Safety | 12 |
| Toronto Fire Services Automated Dispatch - South Zone | Toronto | Public Safety | 12 |
| Southern Georgian Bay Fire Services | Grey | Public Safety | 11 |
| Leeds & Grenville Fire Comms | Leeds and Grenville | Public Safety | 10 |
| Toronto Transit Control | Toronto | Public Safety | 10 |
| Norfolk and Haldimand County Fire | Norfolk | Public Safety | 9 |
| Burlington Fire Department South | Halton | Public Safety | 7 |
| Brantford Fire | Brant | Public Safety | 5 |
| Middlesex County Fire - Tac 1 and 3 | Middlesex | Public Safety | 5 |
| CN, CP, VIA Rail and OSR | Oxford | Rail | 4 |
| Halton Hills / Milton Fire Department | Halton | Public Safety | 4 |
| Essex Fire and Rescue | Essex | Public Safety | 3 |
| Metrolinx Rail Traffic Control | Toronto | Rail | 2 |
| Lambton County Fire | Lambton | Public Safety | 2 |
| Toronto Subway / LRT | Toronto | Rail | 2 |
| Windsor/Essex EMS | Essex | Public Safety | 1 |
| VA3PWR 443.2750 MHz and 53.1300 MHz Repeaters | York | Amateur Radio | 1 |
| Prince Edward County Roads Dept. | Prince Edward | Marine | 1 |
| Marine VHF Search and Rescue CH 16, 65A and 82A | Simcoe | Marine | 1 |
| Manitoulin Amateur Radio Club Repeaters VE3RMI and VE3RQQ | Manitoulin District | Amateur Radio | 1 |
| Toronto Center / Timmins | Cochrane District | Aviation | 1 |
| Lanark County OPP and Fire, Kanata OPP | Lanark | Public Safety | 1 |
| Durham Region GTA East | Toronto | Rail | 1 |
| Grey County Public Safety | Grey | Public Safety | 1 |
| County of Frontenac Public Safety | Frontenac | Public Safety | 1 |
| South Dundas Fire & North Dundas Fire Comm | Stormont, Dundas, Glengarry | Public Safety | 0 |
| Toronto Public Safety | Toronto | Public Safety | 0 |
| Sudbury OPP, Sudbury Volunteer Fire Dispatch, Markstay Fire | Sudbury District | Public Safety | 0 |
| VE3LSR Amateur Radio Repeater | Simcoe | Amateur Radio | 0 |
| VE3BZ 223.580 MHz Simplex Allstar Node | Simcoe | Amateur Radio | 0 |
| Sudbury Area EMS | Sudbury District | Public Safety | 0 |
| Renfrew OPP/EMS | Renfrew | Public Safety | 0 |
| Ontario Northland Railway - New Liskeard Tower | Timiskaming District | Rail | 0 |
| Clarence-Rockland Fire Department Main Channel | Prescott, Russell, United | Public Safety | 0 |
| West Niagara Fire Department | Niagara | Public Safety | 0 |
| VE3YRA Repeater | Grey | Amateur Radio | 0 |
| Jocelyn Fire | Algoma District | Public Safety | 0 |
| Algoma North | Algoma District | Public Safety | 0 |
| OPP Algoma District | Algoma District | Public Safety | 0 |
| Saugeen First Nation Fire | Bruce | Public Safety | 0 |
| Bruce County Fire and Services | Bruce | Public Safety | 0 |
| Montreal Center / Timmins | Cochrane District | Aviation | 0 |
| Timmins Airport Flight Service and Local Area Air Traffic | Cochrane District | Aviation | 0 |
| Meaford Marine VHF (Southern Georgian Bay) | Grey | Marine | 0 |
| Grey County Fire Paging | Grey | Public Safety | 0 |
| Peterborough Amateur Radio Club Repeater Network | Peterborough | Amateur Radio | 0 |
| VA3KKF 443.9750 MHz Repeater | Kawartha Lakes | Amateur Radio | 0 |
| McKenzie Clearwater Fire | Kenora District | Public Safety | 0 |
| London Area Amateur Radio Repeaters | Middlesex | Public Safety | 0 |
| Echo Bay Fire | Algoma District | Public Safety | 0 |
| Fort Erie Fire Department | Niagara | Public Safety | 0 |
| North Bay Ontario Railways | Nipissing District | Rail | 0 |
| Ottawa International Airport | Ottawa | Aviation | 0 |
| Shawanaga First Nation Fire | Parry Sound District | Public Safety | 0 |
| Caledon Fire and Emergency Services TAC 9 | Peel | Public Safety | 0 |