Region List
- L3T 1K3 - Thornhill, York, Ontario
- L3T 1K4 - Thornhill, York, Ontario
- L3T 1K5 - Thornhill, York, Ontario
- L3T 1K6 - Thornhill, York, Ontario
- L3T 1K7 - Thornhill, York, Ontario
- L3T 1K8 - Thornhill, York, Ontario
- L3T 1K9 - Thornhill, York, Ontario
- L3T 1L1 - Thornhill, York, Ontario
- L3T 1L2 - Thornhill, York, Ontario
- L3T 1L3 - Thornhill, York, Ontario
- L3T 1L4 - Thornhill, York, Ontario
- L3T 1L5 - Thornhill, York, Ontario
- L3T 1L6 - Thornhill, York, Ontario
- L3T 1L7 - Thornhill, York, Ontario
- L3T 1L8 - Thornhill, York, Ontario
- L3T 1L9 - Thornhill, York, Ontario
- L3T 1M1 - Thornhill, York, Ontario
- L3T 1M2 - Thornhill, York, Ontario
- L3T 1M3 - Thornhill, York, Ontario
- L3T 1M4 - Thornhill, York, Ontario