Region List
- L3T 1M5 - Thornhill, York, Ontario
- L3T 1M6 - Thornhill, York, Ontario
- L3T 1M7 - Thornhill, York, Ontario
- L3T 1M8 - Thornhill, York, Ontario
- L3T 1M9 - Thornhill, York, Ontario
- L3T 1N1 - Thornhill, York, Ontario
- L3T 1N2 - Thornhill, York, Ontario
- L3T 1N3 - Thornhill, York, Ontario
- L3T 1N4 - Thornhill, York, Ontario
- L3T 1N5 - Thornhill, York, Ontario
- L3T 1N6 - Thornhill, York, Ontario
- L3T 1N7 - Thornhill, York, Ontario
- L3T 1N8 - Thornhill, York, Ontario
- L3T 1N9 - Thornhill, York, Ontario
- L3T 1P1 - Thornhill, York, Ontario
- L3T 1P2 - Thornhill, York, Ontario
- L3T 1P3 - Thornhill, York, Ontario
- L3T 1P5 - Thornhill, York, Ontario
- L3T 1P6 - Thornhill, York, Ontario
- L3T 1P7 - Thornhill, York, Ontario