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

Code Example Agency
x0 10, 20, 30, etc Community Police Officer
x 1, 2, 3, etc Regular District Patrol Officers
x3 13, 23, 33, etc Second Regular District Patrol Officer
2xx 201, 202, 203, etc Bay City Detective/Officer
2x 21, 22, 24, etc Essexville Public Safety
Ixxx I101, I102, I1033, etc State Police Investigator
30xx 30-01, 30-02, 30-03, etc State Police CID
31xx 3101, 3102, 3103, etc State Police-MBS Post
39xx 3901, 3902, 3903, etc U.S. Marshall-Bay City
4xx 401, 402, 403, etc Sheriffs Department Car
41xx 4101, 4102, 4103, etc Sheriff Deputy Patrol Area
480 480 Emergency Svcs Coordinator
49x 496, 497, 498 Sheriff Marine Patrol
7x 71, 72, 73, etc Hampton Twp. Police
8x 81, 82, 83, etc Pinconnning Police
9x 91, 92, 93, etc Delta College Police
14x 141, 142, 143, etc Northern Bay Ambulance
15x 151, 152, 153, etc Medstar Ambulance
(Where 'x' denotes a number)

Bay City Police Districts

2 Columbus North to River, and east to City Limits
3 Downtown
4 River East to City Limits, Kosciuszko to Columbus
5 Kosciuszko South to City Limits
6 Central High Liaison
7 Midland Street and South
8 Midland Street and North; Banks Area
9 Handy Intermediate Liaison

Bay County Fire Station Numbers

1 Bay City - Center Ave.
2 Bay City - Fremont Ave.
4 Bay City - Dean St.
5 Bay City - Smith Street (CLOSED).
6 Bangor Township - Union St.
7 Bangor Towship - Wheeler Rd. (911 Backup Center)
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.