| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Arawa, Central Bougainville | 355 |
| Postal/ZIP Codes in Wakunai, Central Bougainville | 355 |
| Postal Codes in Bougainville | |
|---|---|
| Postal/ZIP Codes in South Bougainville | Postal/ZIP Codes in North Bougainville |
| Postal/ZIP Codes in Central Bougainville | |