The database has everything listed, there is too much to post:
Hastings County, Ontario (ON) Scanner Frequencies and Radio Frequency Reference
Assuming you have only an analog scanner and If you just want Police, OPP BEAT Repeater will do... Fire and CFB Trenton are also analog.
413.53750 RM 107.2 PL OPPBEAT OPP - Beat Repeater FM Law Dispatch
153.77000 RM 100.0 PL QUINTEFIRDSP Fire - Dispatch channel FM Fire Dispatch
154.43000 RM 123.0 PL QUINTEFIRTAC Fire - Tactical channel/Training FM Fire-Tac
If you want to listen to all the OPP in the area then buy a digital scanner and set it up for Fleetnet.