Region List
- L3T 1H1 - Thornhill, York, Ontario
- L3T 1H2 - Thornhill, York, Ontario
- L3T 1H3 - Thornhill, York, Ontario
- L3T 1H4 - Thornhill, York, Ontario
- L3T 1H5 - Thornhill, York, Ontario
- L3T 1H6 - Thornhill, York, Ontario
- L3T 1H7 - Thornhill, York, Ontario
- L3T 1H8 - Thornhill, York, Ontario
- L3T 1H9 - Thornhill, York, Ontario
- L3T 1J1 - Thornhill, York, Ontario
- L3T 1J2 - Thornhill, York, Ontario
- L3T 1J3 - Thornhill, York, Ontario
- L3T 1J4 - Thornhill, York, Ontario
- L3T 1J5 - Thornhill, York, Ontario
- L3T 1J6 - Thornhill, York, Ontario
- L3T 1J7 - Thornhill, York, Ontario
- L3T 1J8 - Thornhill, York, Ontario
- L3T 1J9 - Thornhill, York, Ontario
- L3T 1K1 - Thornhill, York, Ontario
- L3T 1K2 - Thornhill, York, Ontario