| Eastern Samar | |
| Area | Zip |
| Arteche | 6822 |
| Balangiga | 6812 |
| Balangkayan | 6801 |
| Borongan | 6800 |
| Can-Avid | 6806 |
| Dolores | 6817 |
| General MacArthur | 6805 |
| Giporlos | 6811 |
| Guiuan | 6809 |
| Hernani | 6804 |
| Jipapad | 6819 |
| Lawa-an | 6813 |
| Llorente | 6803 |
| Maslog | 6820 |
| Maydulong | 6802 |
| Mercedes | 6808 |
| Oras | 6818 |
| Quinapundan | 6810 |
| Salcedo | 6807 |
| San Julian | 6814 |
| San Policarpio | 6821 |
| Sulat | 6815 |
| Taft | 6816 |
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