York Region Fire Departments
This is what I posted on Scanont a while ago, and to my knowledge it hasn't changed.
There are the "operations" channels for the York Fire Departments.
A2 - Vaughan
A7 - King Twp
B2 - Georgina, East Gwillumbury, Central York
B3 - Richmond Hill
C2 - Markham, Whitchurch-Stouffville
Vaughan incidents you will find on A3, A4, A5
King Twp incidents you will find on A7 or A8 (mostly just A7)
Georgina, East Gwillumbury, Central York incidents on B4, B6, B8
Richmond Hill incidents on B5, B7
I'm not sure if Markham/Whitchurch-Stouffville have specific channels for their incidents, but they will definitely be in C3-C8 range.