Transmissions often start with the sender identifying themselves (such as "Forty-One-Oh-Two", a sheriff deputy), followed by whom they're trying to communicate with ("Central", being Central Dispatch).
Bay County Unit Numbers
X Regular district patrol officer
X3 Second regular district patrol officer
2XX Bay City Detectives/Officers
GX Gang Task Force
2x Essexville public safety-(PD / Fire)
3x Auburn
Ixxx State Police Investigators
30xx State police C.I.D.
31xx State Police - Post 31 Bay City
39xx U.S. Marshall’s - Bay City
4xx Sheriffs department car
41xx Sheriff Deputies patrol area
480 Emergency Services Coordinator
496, 497 & 498 - Sheriff marine patrol
7x Hampton Township
8x Pinconning
9x Delta College
14x Northern Bay Ambulance-Pinconning
15x Bay Regional Medical Center Ambulance
(Where 'x' denotes a number.)
Bay City Police Districts
2 - Columbus north to the river & east to the city limits3 - Downtown
4 - River to the city limits east, Kosciuszko to Columbus
5 - Kosciuszko & South
6 - Central High (DARE Officer)
7 - Midland Street & South
8 - Midland Street, Banks area to northeast city limits
9 - Handy Intermediate (DARE Officer)
Bay County Fire Station Numbers
Bay City:1 - Center Ave.(HQ)
2 - Fremont Ave.
3 - Administration (Although, I have seen an "Engine 3", which I believe is stationed at Center Ave.)
4 - Dean Street
5 - Smith Street (CLOSED)
Bangor Township:
6 - Union Street
7 - Wheeler rd. (HQ) & 911 Backup Center
Other Stations:
8 - Hampton Township 10 - Monitor Township 12 - Auburn/Williams Township
14 - Kawkawlin Township 15 - Pinconning 16 - Fraser Township
17 - Essexville 18 - Portsmouth Township 19 - Beaver Township
20 - Frankenlust Township 21 - Garfield Township 22 - Merritt Township
23 - Mount Forest Township 24 - Gibson Township