Liste de la région
- L4P 4A9 - Keswick, York, Ontario
- L4P 4B1 - Keswick, York, Ontario
- L4P 4B2 - Keswick, York, Ontario
- L4P 4B3 - Keswick, York, Ontario
- L4P 4B4 - Keswick, York, Ontario
- L4P 4B5 - Keswick, York, Ontario
- L4P 4B6 - Keswick, York, Ontario
- L4P 4B7 - Keswick, York, Ontario
- L4P 4B8 - Keswick, York, Ontario
- L4P 4B9 - Keswick, York, Ontario
- L4P 4C1 - Keswick, York, Ontario
- L4P 4C2 - Keswick, York, Ontario
- L4P 4C3 - Keswick, York, Ontario
- L4P 4C4 - Keswick, York, Ontario
- L4P 4C5 - Keswick, York, Ontario
- L4P 4C6 - Keswick, York, Ontario
- L4P 4C7 - Keswick, York, Ontario
- L4P 4C8 - Keswick, York, Ontario
- L4P 4C9 - Keswick, York, Ontario
- L4P 4E1 - Keswick, York, Ontario