Region List
- L4A 1E1 - Stouffville, York, Ontario
- L4A 1E2 - Stouffville, York, Ontario
- L4A 1E3 - Stouffville, York, Ontario
- L4A 1E4 - Stouffville, York, Ontario
- L4A 1E5 - Stouffville, York, Ontario
- L4A 1E6 - Stouffville, York, Ontario
- L4A 1E7 - Stouffville, York, Ontario
- L4A 1E8 - Stouffville, York, Ontario
- L4A 1E9 - Stouffville, York, Ontario
- L4A 1G1 - Stouffville, York, Ontario
- L4A 1G2 - Stouffville, York, Ontario
- L4A 1G3 - Stouffville, York, Ontario
- L4A 1G4 - Stouffville, York, Ontario
- L4A 1G5 - Stouffville, York, Ontario
- L4A 1G6 - Stouffville, York, Ontario
- L4A 1G7 - Stouffville, York, Ontario
- L4A 1G8 - Stouffville, York, Ontario
- L4A 1G9 - Stouffville, York, Ontario
- L4A 1H1 - Stouffville, York, Ontario
- L4A 1H2 - Stouffville, York, Ontario