Lista de la región
- L4P 2X4 - Keswick, York, Ontario
- L4P 2X6 - Keswick, York, Ontario
- L4P 2X5 - Keswick, York, Ontario
- L4P 2X7 - Keswick, York, Ontario
- L4P 2X8 - Keswick, York, Ontario
- L4P 2X9 - Keswick, York, Ontario
- L4P 2Y3 - Keswick, York, Ontario
- L4P 2Y4 - Keswick, York, Ontario
- L4P 2Y5 - Keswick, York, Ontario
- L4P 2Y6 - Keswick, York, Ontario
- L4P 2Y7 - Keswick, York, Ontario
- L4P 2Y8 - Keswick, York, Ontario
- L4P 2Z1 - Keswick, York, Ontario
- L4P 2Y9 - Keswick, York, Ontario
- L4P 2Z3 - Keswick, York, Ontario
- L4P 2Z2 - Keswick, York, Ontario
- L4P 2Z4 - Keswick, York, Ontario
- L4P 2Z5 - Keswick, York, Ontario
- L4P 2Z6 - Keswick, York, Ontario
- L4P 2Z7 - Keswick, York, Ontario