Current Southern Ontario Zones
As of the 2010-11 YBC Youth Bowling season, the bowling centres within 4 zones were dispersed into the other twelve zones, thereby reducing the total number of zones in Southern Ontario to 12. The following is a list of the 12 zones, along with the regions they cover, which comprise the YBC in Southern Ontario:
| Zone | Region |
| A | Southwestern Ontario (Windsor-Sarnia-Chatham & Region) |
| B | London & District |
| C | Conestoga (Kitchener-Waterloo-Cambridge & Region) |
| D | Niagara Peninsula |
| E | Hamilton & Brantford District |
| F | Toronto-West, Mississauga & Peel Region |
| G | York-Simcoe (Toronto-North, Newmarket & Simcoe Region) |
| H | Huronia (Barrie, Penetanguishene & Region) |
| J | Toronto-East & Durham Region) |
| K | Bay of Quinte & Kawartha Districts |
| R | St. Lawrence Valley (Kingston to Cornwall) |
| X | Ottawa & Ottawa Valley |
Historic Southern Ontario Zones
The following is a list of the 16 historic YBC Youth Bowling zones, which existed in Southern Ontario along with the regions they covered until the end of the 2009-10 season:
For a list of each zone's head representative, please click HERE.