| Place | Post Code |
|---|---|
| Parwania Arazi, Kosi) | 852202 |
| Patuaha, Kosi) | 852202 |
| Rampur, Kosi) | 852202 |
| Rasalpur, Kosi) | 852129 |
| Rohua, Kosi) | 852124 |
| Rohuamon, Kosi) | 852212 |
| Rupanagar, Kosi) | 852202 |
| Saharsa, Kosi) | 852202, 852201 |
| Simraha, Kosi) | 852202 |
| Siradipatti, Kosi) | 852202 |
| Sulindabad, Kosi) | 852202 |
| Tulsiahipatti, Kosi) | 852124 |
| Postal Codes in Saharsa | |
|---|---|
| Banma Itahri | |
| Kahara | |
| Mahishi | |
| Nauhatta | |
| Patarghat | |
| Salkhua | |
| Satar Kataiya | |
| Saur Bazar | |
| Simri Bakhtiarpur | |
| Sonbarsa | |