Lista de la región
- L4P 1B5 - Keswick, York, Ontario
- L4P 1B4 - Keswick, York, Ontario
- L4P 1B6 - Keswick, York, Ontario
- L4P 1B7 - Keswick, York, Ontario
- L4P 1B8 - Keswick, York, Ontario
- L4P 1B9 - Keswick, York, Ontario
- L4P 1C1 - Keswick, York, Ontario
- L4P 1C2 - Keswick, York, Ontario
- L4P 1C3 - Keswick, York, Ontario
- L4P 1C4 - Keswick, York, Ontario
- L4P 1C5 - Keswick, York, Ontario
- L4P 1C6 - Keswick, York, Ontario
- L4P 1C7 - Keswick, York, Ontario
- L4P 1C8 - Keswick, York, Ontario
- L4P 1C9 - Keswick, York, Ontario
- L4P 1E1 - Keswick, York, Ontario
- L4P 1E2 - Keswick, York, Ontario
- L4P 1E3 - Keswick, York, Ontario
- L4P 1E4 - Keswick, York, Ontario
- L4P 1E5 - Keswick, York, Ontario