Region List
- L3T 1Y5 - Thornhill, York, Ontario
- L3T 1Y6 - Thornhill, York, Ontario
- L3T 1Y7 - Thornhill, York, Ontario
- L3T 1Y8 - Thornhill, York, Ontario
- L3T 1Y9 - Thornhill, York, Ontario
- L3T 1Z1 - Thornhill, York, Ontario
- L3T 1Z2 - Thornhill, York, Ontario
- L3T 1Z3 - Thornhill, York, Ontario
- L3T 1Z4 - Thornhill, York, Ontario
- L3T 1Z5 - Thornhill, York, Ontario
- L3T 1Z6 - Thornhill, York, Ontario
- L3T 1Z7 - Thornhill, York, Ontario
- L3T 1Z8 - Thornhill, York, Ontario
- L3T 1Z9 - Thornhill, York, Ontario
- L3T 2A2 - Thornhill, York, Ontario
- L3T 2A3 - Thornhill, York, Ontario
- L3T 2A4 - Thornhill, York, Ontario
- L3T 2A5 - Thornhill, York, Ontario
- L3T 2A6 - Thornhill, York, Ontario
- L3T 2A7 - Thornhill, York, Ontario