| Northern Samar | |
| Area | Zip |
| Allen | 6405 |
| Biri | 6410 |
| Bobon | 6401 |
| Capul | 6408 |
| Catarman | 6400 |
| Catubig | 6418 |
| Gamay | 6422 |
| La Navas | 6420 |
| Laoang | 6411 |
| Lapineg | 6423 |
| Lavezares | 6404 |
| Lope de Vega | 6403 |
| Mapanas | 6412 |
| Mondragon | 6417 |
| Palapag | 6421 |
| Pambujan | 6413 |
| Rosario | 6416 |
| San Antonio | 6407 |
| San Isidro | 6409 |
| San Jose | 6402 |
| San Roque | 6415 |
| San Vicente | 6419 |
| Silvino Lubos | 6414 |
| Victoria | 6406 |
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