Region List
- L4P 1Y5 - Keswick, York, Ontario
- L4P 1Y6 - Keswick, York, Ontario
- L4P 1Y7 - Keswick, York, Ontario
- L4P 1Y8 - Keswick, York, Ontario
- L4P 1Y4 - Keswick, York, Ontario
- L4P 1Y9 - Keswick, York, Ontario
- L4P 1Z1 - Keswick, York, Ontario
- L4P 1Z3 - Keswick, York, Ontario
- L4P 1Z4 - Keswick, York, Ontario
- L4P 1Z6 - Keswick, York, Ontario
- L4P 1Z7 - Keswick, York, Ontario
- L4P 1Z8 - Keswick, York, Ontario
- L4P 2A1 - Keswick, York, Ontario
- L4P 2A2 - Keswick, York, Ontario
- L4P 2A3 - Keswick, York, Ontario
- L4P 2A4 - Keswick, York, Ontario
- L4P 2A5 - Keswick, York, Ontario
- L4P 2A6 - Keswick, York, Ontario
- L4P 2A7 - Keswick, York, Ontario
- L4P 2A8 - Keswick, York, Ontario