Region List
- L4A 0S9 - Stouffville, York, Ontario
- L4A 0T1 - Stouffville, York, Ontario
- L4A 0T2 - Stouffville, York, Ontario
- L4A 0T3 - Stouffville, York, Ontario
- L4A 0T4 - Stouffville, York, Ontario
- L4A 0T5 - Stouffville, York, Ontario
- L4A 0T6 - Stouffville, York, Ontario
- L4A 0T7 - Stouffville, York, Ontario
- L4A 0T8 - Stouffville, York, Ontario
- L4A 0T9 - Stouffville, York, Ontario
- L4A 0V1 - Stouffville, York, Ontario
- L4A 0V2 - Stouffville, York, Ontario
- L4A 0V3 - Stouffville, York, Ontario
- L4A 0V4 - Stouffville, York, Ontario
- L4A 0V5 - Stouffville, York, Ontario
- L4A 0V6 - Stouffville, York, Ontario
- L4A 0V7 - Stouffville, York, Ontario
- L4A 0V8 - Stouffville, York, Ontario
- L4A 0V9 - Stouffville, York, Ontario
- L4A 0W1 - Stouffville, York, Ontario