Region List
- L4J 9J7 - Thornhill, York, Ontario
- L4J 9J8 - Thornhill, York, Ontario
- L4J 9J9 - Thornhill, York, Ontario
- L4J 9K1 - Thornhill, York, Ontario
- L4J 9K2 - Thornhill, York, Ontario
- L4J 9K3 - Thornhill, York, Ontario
- L4J 9K4 - Thornhill, York, Ontario
- L4J 9K5 - Thornhill, York, Ontario
- L4J 9K6 - Thornhill, York, Ontario
- L4J 9K7 - Thornhill, York, Ontario
- L4J 9K8 - Thornhill, York, Ontario
- L4J 9K9 - Thornhill, York, Ontario
- L4J 9L1 - Thornhill, York, Ontario