| Place | Post Code |
|---|---|
| Bara Singhia, Kosi) | 852107 |
| Barsam, Kosi) | 852217, 852221 |
| Bishanpur, Kosi) | 852107 |
| Dhabauli, Kosi) | 852107 |
| Gulam, Kosi) | 852107 |
| Jamhara, Kosi) | 852217 |
| Jirwa, Kosi) | 852107 |
| Kapasia, Kosi) | 852107 |
| Kishanpur, Kosi) | 852217 |
| Lachhmipur, Kosi) | 852107 |
| Paharpur, Kosi) | 852217 |
| Pama, Kosi) | 852107 |
| Pastpar, Kosi) | 852107 |
| Patarghat, Kosi) | 852107 |
| Rahua, Kosi) | 852127 |
| Sahgaura, Kosi) | 852107 |
| Sour Bazar, Kosi) | 852221 |
| Postal Codes in Saharsa | |
|---|---|
| Banma Itahri | |
| Kahara | |
| Mahishi | |
| Nauhatta | |
| Patarghat | |
| Salkhua | |
| Satar Kataiya | |
| Saur Bazar | |
| Simri Bakhtiarpur | |
| Sonbarsa | |