| Place | Post Code |
|---|---|
| Senuaria, Tirhut) | 845305 |
| Sidhpur, Tirhut) | 845305 |
| Sihorwa, Tirhut) | 845305 |
| Sihpur, Tirhut) | 845305 |
| Sirampur, Tirhut) | 845305 |
| Sirisiya Nizamat, Tirhut) | 845301, 845305 |
| Sirsia Birit, Tirhut) | 845301, 845305 |
| Siswa, Tirhut) | 845301, 845305 |
| Siswaniyan, Tirhut) | 845301 |
| Sitalpur, Tirhut) | 845305 |
| Srirampur, Tirhut) | 845305 |