The following are the zip codes in the municipalities of Biliran.
| Region | Provinces | City/Municipality | Zip Code |
| Region 8 (Eastern Visayas) | Biliran | Almeria | 6544 |
| Region 8 (Eastern Visayas) | Biliran | Biliran | 6549 |
| Region 8 (Eastern Visayas) | Biliran | Cabuccayan | 6550 |
| Region 8 (Eastern Visayas) | Biliran | Caibiran | 6548 |
| Region 8 (Eastern Visayas) | Biliran | Culaba | 6547 |
| Region 8 (Eastern Visayas) | Biliran | Kawayan | 6545 |
| Region 8 (Eastern Visayas) | Biliran | Maripipi | 6546 |
| Region 8 (Eastern Visayas) | Biliran | Naval | 6543 |
