| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Bugis, Biau | 94563 |
| Postal/ZIP Codes in Buol, Biau | 94563 |
| Postal/ZIP Codes in Kali, Biau | 94563 |
| Postal/ZIP Codes in Kulango, Biau | 94563 |
| Postal/ZIP Codes in Kumaligon, Biau | 94563 |
| Postal/ZIP Codes in Leok I, Biau | 94563 |
| Postal/ZIP Codes in Leok II, Biau | 94563 |