The following are the zip codes in the municipalities of Northern Samar.
| Region | Provinces | City/Municipality | Zip Code |
| Region 8 (Eastern Visayas) | Northern Samar | Allen | 6405 |
| Region 8 (Eastern Visayas) | Northern Samar | Biri | 6410 |
| Region 8 (Eastern Visayas) | Northern Samar | Bobon | 6401 |
| Region 8 (Eastern Visayas) | Northern Samar | Capul | 6408 |
| Region 8 (Eastern Visayas) | Northern Samar | Catarman | 6400 |
| Region 8 (Eastern Visayas) | Northern Samar | Catubig | 6418 |
| Region 8 (Eastern Visayas) | Northern Samar | Gamay | 6422 |
| Region 8 (Eastern Visayas) | Northern Samar | La Navas | 6420 |
| Region 8 (Eastern Visayas) | Northern Samar | Laoang | 6411 |
| Region 8 (Eastern Visayas) | Northern Samar | Lapineg | 6423 |
| Region 8 (Eastern Visayas) | Northern Samar | Lavezares | 6404 |
| Region 8 (Eastern Visayas) | Northern Samar | Lope de Vega | 6403 |
| Region 8 (Eastern Visayas) | Northern Samar | Mapanas | 6412 |
| Region 8 (Eastern Visayas) | Northern Samar | Mondragon | 6417 |
| Region 8 (Eastern Visayas) | Northern Samar | Palapag | 6421 |
| Region 8 (Eastern Visayas) | Northern Samar | Pambujan | 6413 |
| Region 8 (Eastern Visayas) | Northern Samar | Rosario | 6416 |
| Region 8 (Eastern Visayas) | Northern Samar | San Antonio | 6407 |
| Region 8 (Eastern Visayas) | Northern Samar | San Isidro | 6409 |
| Region 8 (Eastern Visayas) | Northern Samar | San Jose | 6402 |
| Region 8 (Eastern Visayas) | Northern Samar | San Roque | 6415 |
| Region 8 (Eastern Visayas) | Northern Samar | San Vicente | 6419 |
| Region 8 (Eastern Visayas) | Northern Samar | Silvino Lubos | 6414 |
| Region 7 (Central Visayas) | Northern Samar | Victoria | 6406 |
