Region List
- L3T 1W3 - Thornhill, York, Ontario
- L3T 1W4 - Thornhill, York, Ontario
- L3T 1W5 - Thornhill, York, Ontario
- L3T 1W6 - Thornhill, York, Ontario
- L3T 1W7 - Thornhill, York, Ontario
- L3T 1W8 - Thornhill, York, Ontario
- L3T 1W9 - Thornhill, York, Ontario
- L3T 1X1 - Thornhill, York, Ontario
- L3T 1X2 - Thornhill, York, Ontario
- L3T 1X3 - Thornhill, York, Ontario
- L3T 1X4 - Thornhill, York, Ontario
- L3T 1X5 - Thornhill, York, Ontario
- L3T 1X6 - Thornhill, York, Ontario
- L3T 1X7 - Thornhill, York, Ontario
- L3T 1X8 - Thornhill, York, Ontario
- L3T 1X9 - Thornhill, York, Ontario
- L3T 1Y1 - Thornhill, York, Ontario
- L3T 1Y2 - Thornhill, York, Ontario
- L3T 1Y3 - Thornhill, York, Ontario
- L3T 1Y4 - Thornhill, York, Ontario