| Pittsburgh Police, Fire and EMS | Allegheny | Public Safety | 370 |
| Westmoreland County Public Safety | Westmoreland | Public Safety | 128 |
| Fayette County ICORRS Public Safety Dispatch | Fayette | Public Safety | 103 |
| Armstrong County Public Safety | Armstrong | Public Safety | 72 |
| Franklin County Fire and EMS Alerts | Franklin | Public Safety | 59 |
| Clarion County Public Safety | Clarion | Public Safety | 55 |
| Adams County Fire and EMS - Digital | Adams | Public Safety | 54 |
| Schuylkill County Fire | Schuylkill | Public Safety | 53 |
| Erie County Fire and EMS | Erie | Public Safety | 49 |
| Lycoming County Public Safety | Lycoming | Public Safety | 48 |
| Somerset County Fire and EMS - Digital | Somerset | Public Safety | 47 |
| Mifflin County Fire and EMS | Mifflin | Public Safety | 44 |
| Blair County EMS, Fire, Police, Hazmat and Helos | Blair | Public Safety | 44 |
| Huntingdon County Fire and EMS | Huntingdon | Public Safety | 43 |
| Indiana County Fire Dispatch and Fireground Operations | Indiana | Public Safety | 43 |
| Clearfield County Fire and EMS | Clearfield | Public Safety | 41 |
| Pittsburgh Fire Ground 2 | Allegheny | Public Safety | 39 |
| Northumberland County Fire and EMS | Northumberland | Public Safety | 38 |
| Bedford County Fire, EMS and Law | Bedford | Public Safety | 38 |
| Tioga County Police, Fire and EMS | Tioga | Public Safety | 37 |
| Clinton County Public Safety | Clinton | Public Safety | 34 |
| Juniata County Fire and EMS | Juniata | Public Safety | 34 |
| Berks County Fire and EMS - Digital | Berks | Public Safety | 34 |
| Luzerne County Fire and EMS | Luzerne | Public Safety | 33 |
| Dauphin County Fire and EMS Dispatch - Digital | Dauphin | Public Safety | 32 |
| Centre and Clearfield Counties Fire | Centre | Public Safety | 32 |
| Butler County Fire and EMS | Butler | Public Safety | 31 |
| Lawrence County Fire and EMS - North | Lawrence | Public Safety | 31 |
| Allegheny County Police, Fire and EMS - Southern Areas | Allegheny | Public Safety | 27 |
| Perry County Fire and EMS | Perry | Public Safety | 27 |
| Cambria County Fire and EMS | Cambria | Public Safety | 27 |
| Warren County Sheriff, Fire and EMS Dispatch | Warren | Public Safety | 24 |
| Lebanon County Fire | Lebanon | Public Safety | 22 |
| Elk County Police, Fire and EMS | Elk | Public Safety | 21 |
| Allegheny County East PD 1 and East PD 3 | Allegheny | Public Safety | 21 |
| Venango County Police, Fire, and EMS | Venango | Public Safety | 20 |
| Philadelphia Fire - South Fire/South Medics | Philadelphia | Public Safety | 19 |
| Fayette County Public Safety Dispatch | Fayette | Public Safety | 18 |
| Philadelphia Fire Dispatch - North | Philadelphia | Public Safety | 18 |
| Philadelphia Police Dispatch - Northeast | Philadelphia | Public Safety | 18 |
| Potter and McKean County Fire and EMS | McKean | Public Safety | 17 |
| Cameron County Police, Fire and EMS | Cameron | Public Safety | 17 |
| Crawford County Fire and EMS - Central | Crawford | Public Safety | 16 |
| Mercer County Fire / EMS, Trumbull and Mahoning Counties Fire, EMS / Police | Mercer | Public Safety | 16 |
| Philadelphia Police - Citywide | Philadelphia | Public Safety | 16 |
| Lehigh County Fire and Northampton County Fire Tac-5 | Lehigh | Public Safety | 15 |
| Delaware County Public Safety | Delaware | Public Safety | 14 |
| Carlisle Fire and EMS Dispatch | Cumberland | Public Safety | 14 |
| Columbia and Montour County Fire and EMS Dispatch | Columbia | Public Safety | 14 |
| Washington City Fire, County Zone 1 Fire and EMS | Washington | Public Safety | 14 |
| East Central Emergency Network Fire and EMS | Columbia | Public Safety | 13 |
| Philadelphia Police Dispatch - South | Philadelphia | Public Safety | 13 |
| Lancaster County Fire and EMS - Digital | Lancaster | Public Safety | 13 |
| Montgomery County Fire and EMS - Digital | Montgomery | Public Safety | 12 |
| NS Harrisburg Terminal Dispatch | Cumberland | Rail | 12 |
| Chester County Fire/EMS - Digital | Chester | Public Safety | 12 |
| N3ST Repeater System | Adams | Amateur Radio | 11 |
| McKean County Public Safety, Elk County Fire | Elk | Public Safety | 11 |
| Beaver County Fire and EMS | Beaver | Public Safety | 11 |
| Pike County and Lackawaxen Fire and EMS | Pike | Public Safety | 10 |
| Lebanon County EMS, Fire Police and Hazmat | Lebanon | Public Safety | 9 |
| Snyder County Fire and EMS | Snyder | Public Safety | 9 |
| Pittsburgh Police Channel 2 - Zone 3/6 | Allegheny | Public Safety | 9 |
| Carbon County and Northampton County Fire/EMS | Carbon | Public Safety | 9 |
| McKean County / Bradford Area Fire/EMS | McKean | Public Safety | 8 |
| Somerset County Fire and EMS - Analog | Somerset | Public Safety | 8 |
| Dauphin County Fire - Digital | Dauphin | Public Safety | 8 |
| Perry County Emergency Services | Perry | Public Safety | 8 |
| Delaware County Fire/EMS - Countywide Ops | Delaware | Public Safety | 8 |
| Pittsburgh Police Dispatch | Allegheny | Public Safety | 8 |
| Allegheny County Fire - North | Allegheny | Public Safety | 8 |
| Bucks County Fire North and OPs | Bucks | Public Safety | 7 |
| Union County Fire | Union | Public Safety | 7 |
| Venango County Fire Departments, Oil City Police | Venango | Public Safety | 7 |
| Monroeville Fire and EMS | Allegheny | Public Safety | 7 |
| Northampton County Fire and EMS Dispatch | Northampton | Public Safety | 7 |
| Delaware County Police - PD Sector 5 | Delaware | Public Safety | 6 |
| Mercer County Fire/EMS | Mercer | Public Safety | 6 |
| Lycoming County Fire and EMS Dispatch | Lycoming | Public Safety | 6 |
| Washington County Police Zone 2 | Washington | Public Safety | 6 |
| Bucks County Fire - South/Ops | Bucks | Public Safety | 6 |
| Chester County Law Enforcement Dispatch | Chester | Public Safety | 6 |
| Luzerne County EMS | Luzerne | Public Safety | 6 |
| Armstrong/Westmoreland Public Safety | Armstrong | Public Safety | 6 |
| Philadelphia Police Dispatch - Southwest | Philadelphia | Public Safety | 6 |
| Washington County Fire - Zone 3 | Washington | Public Safety | 5 |
| Westmoreland County Fire | Westmoreland | Public Safety | 5 |
| Fulton County Fire and EMS | Fulton | Public Safety | 5 |
| Dauphin County - Fire (Dispatch, Firegrounds, and Fire Police) | Dauphin | Public Safety | 5 |
| Lehigh County Police | Lehigh | Public Safety | 5 |
| Jefferson County Med 9 Dispatch | Jefferson | Public Safety | 5 |
| Central Susquehanna Regional 911 | Union | Public Safety | 5 |
| Luzerne, Wyoming, and Lackawanna County Public Safety | Lackawanna | Public Safety | 5 |
| Bucks County Fire - East | Bucks | Public Safety | 5 |
| Montgomery County Fire and EMS East, Bucks Fire/EMS West | Bucks | Public Safety | 5 |
| Central Pennsylvania Fire and EMS | Cumberland | Public Safety | 5 |
| Jefferson County Fire | Jefferson | Public Safety | 5 |
| Philadelphia Police Dispatch - Central | Philadelphia | Public Safety | 5 |
| Tioga County Fire | Tioga | Public Safety | 5 |
| Allegheny County Police - North Ch 10 | Allegheny | Public Safety | 4 |