Liste de la région
- L1B 0A1 - Newcastle, Durham, Ontario
- L1B 0A2 - Newcastle, Durham, Ontario
- L1B 0A3 - Newcastle, Durham, Ontario
- L1B 0A4 - Newcastle, Durham, Ontario
- L1B 0A5 - Newcastle, Durham, Ontario
- L1B 0A6 - Newcastle, Durham, Ontario
- L1B 0A7 - Newcastle, Durham, Ontario
- L1B 0A8 - Newcastle, Durham, Ontario
- L1B 0A9 - Newcastle, Durham, Ontario
- L1B 0B1 - Newcastle, Durham, Ontario
- L1B 0B2 - Newcastle, Durham, Ontario
- L1B 0B3 - Newcastle, Durham, Ontario
- L1B 0B4 - Newcastle, Durham, Ontario
- L1B 0B5 - Newcastle, Durham, Ontario
- L1B 0B6 - Newcastle, Durham, Ontario
- L1B 0B7 - Newcastle, Durham, Ontario
- L1B 0B8 - Newcastle, Durham, Ontario
- L1B 0B9 - Newcastle, Durham, Ontario
- L1B 0C1 - Newcastle, Durham, Ontario
- L1B 0C2 - Newcastle, Durham, Ontario