Region List
- L4A 4S6 - Stouffville, York, Ontario
- L4A 4S7 - Stouffville, York, Ontario
- L4A 4S8 - Stouffville, York, Ontario
- L4A 4S9 - Stouffville, York, Ontario
- L4A 4T1 - Stouffville, York, Ontario
- L4A 4T2 - Stouffville, York, Ontario
- L4A 4T3 - Stouffville, York, Ontario
- L4A 4T5 - Stouffville, York, Ontario
- L4A 4T6 - Stouffville, York, Ontario
- L4A 4T8 - Stouffville, York, Ontario
- L4A 4T9 - Stouffville, York, Ontario
- L4A 4Y1 - Stouffville, York, Ontario
- L4A 4X9 - Stouffville, York, Ontario
- L4A 4Y2 - Stouffville, York, Ontario
- L4A 4Y3 - Stouffville, York, Ontario
- L4A 4Y4 - Stouffville, York, Ontario
- L4A 4Y6 - Stouffville, York, Ontario
- L4A 4Y7 - Stouffville, York, Ontario
- L4A 4Y8 - Stouffville, York, Ontario
- L4A 4Y9 - Stouffville, York, Ontario