jlewsader,
This is my neck of the woods so I have a little bit of insight on this.
Fountain/Warren Regional Dispatch: Dispatch
Sheriff / Police Departments
86-XX: Warren County Sheriff's Office Units
West Lebanon Town Marshall/Deputy Marshall are Warren County Deputies so they "normally" use their 86 Unit ID.
23-XX: Fountain County Sheriff's Office Units
Unit-XX: Attica PD Units
23-2X: Covington PD Units
23-3X: Veedersburg PD Units
23-4X(Possibly): Hillsboro Town Marshall/PD
Volunteer Fire Departments
100 Units Attica VFD
200 Units Pine Village VFD
300 Williamsport VFD
400 West Lebanon VFD also Perrysville VFD (covers parts of Fountain County)
500 Covington/Mound Township VFD
600 Veedersburg VFD
800 Hillsboro VFD
1100 Mellott VFD
1300 Wallace/Jackson Township VFD
If you hear F-XXX (F-501) this is a firefighter of the department portable, as opposed to Tanker 56 which is a piece of their apparatus.
EMS
Warren County EMS
I don't hear their rigs as often, I don't remember how they are numbered
Fountain County EMS
EMS-1: Attica
EMS-2: Veedersburg
EMS-3: Veedersburg
EMS-4: Veedersburg (Back-Up/Special Events)
23-R: Veedersburg Rescue Truck(Extrication for smaller agencies who don't have the tools and back-up to the departments who do). Manned by EMS-2/3 crew.
I hope this all makes sense, and it helps!
Dennis
KJ6CSW