Liste de la région
- L1B 1N4 - Newcastle, Durham, Ontario
- L1B 1N5 - Newcastle, Durham, Ontario
- L1B 1N6 - Newcastle, Durham, Ontario
- L1B 1N7 - Newcastle, Durham, Ontario
- L1B 1N8 - Newcastle, Durham, Ontario
- L1B 1N9 - Newcastle, Durham, Ontario
- L1B 1P1 - Newcastle, Durham, Ontario
- L1B 1P2 - Newcastle, Durham, Ontario
- L1B 1P3 - Newcastle, Durham, Ontario
- L1B 1P4 - Newcastle, Durham, Ontario
- L1B 1P5 - Newcastle, Durham, Ontario
- L1B 1P6 - Newcastle, Durham, Ontario
- L1B 1P7 - Newcastle, Durham, Ontario
- L1B 1P8 - Newcastle, Durham, Ontario
- L1B 1P9 - Newcastle, Durham, Ontario
- L1B 1R1 - Newcastle, Durham, Ontario
- L1B 1R2 - Newcastle, Durham, Ontario
- L1B 1R3 - Newcastle, Durham, Ontario
- L1B 1R4 - Newcastle, Durham, Ontario
- L1B 1R5 - Newcastle, Durham, Ontario