The following are the zip codes in the municipalities and cities of Eastern Samar.
| Region | Provinces | City/Municipality | Zip Code |
| Region 8 (Eastern Visayas) | Eastern Samar | Arteche | 6822 |
| Region 8 (Eastern Visayas) | Eastern Samar | Balangiga | 6812 |
| Region 8 (Eastern Visayas) | Eastern Samar | Balangkayan | 6801 |
| Region 8 (Eastern Visayas) | Eastern Samar | Borongan | 6800 |
| Region 8 (Eastern Visayas) | Eastern Samar | Can-Avid | 6806 |
| Region 8 (Eastern Visayas) | Eastern Samar | Dolores | 6817 |
| Region 8 (Eastern Visayas) | Eastern Samar | Gen. McArthur | 6805 |
| Region 8 (Eastern Visayas) | Eastern Samar | Giporlos | 6811 |
| Region 8 (Eastern Visayas) | Eastern Samar | Guiuan | 6809 |
| Region 8 (Eastern Visayas) | Eastern Samar | Hernani | 6804 |
| Region 8 (Eastern Visayas) | Eastern Samar | Jipapad | 6819 |
| Region 8 (Eastern Visayas) | Eastern Samar | Lawa-an | 6813 |
| Region 8 (Eastern Visayas) | Eastern Samar | Llorente | 6803 |
| Region 8 (Eastern Visayas) | Eastern Samar | Maslog | 6820 |
| Region 8 (Eastern Visayas) | Eastern Samar | Maydulog | 6802 |
| Region 8 (Eastern Visayas) | Eastern Samar | Mercedes | 6808 |
| Region 8 (Eastern Visayas) | Eastern Samar | Oras | 6818 |
| Region 8 (Eastern Visayas) | Eastern Samar | Quinapundan | 6810 |
| Region 8 (Eastern Visayas) | Eastern Samar | Salcedo | 6807 |
| Region 8 (Eastern Visayas) | Eastern Samar | San Julian | 6814 |
| Region 8 (Eastern Visayas) | Eastern Samar | San Policarpio | 6821 |
| Region 8 (Eastern Visayas) | Eastern Samar | Sulat | 6815 |
| Region 8 (Eastern Visayas) | Eastern Samar | Taft | 6816 |
