| Place | Post Code |
|---|---|
| Santpur, Tirhut) | 845106 |
| Sapahi, Tirhut) | 845106 |
| Semari Dumari, Tirhut) | 845106 |
| Semra, Tirhut) | 845103 |
| Serahwa, Tirhut) | 845103 |
| Serwa Done, Tirhut) | 845106 |
| Shekhpurwa, Tirhut) | 845455 |
| Shivpurwa, Tirhut) | 845106 |
| Sigari Bigari, Tirhut) | 845106 |
| Sigri, Tirhut) | 845106 |
| Sikta, Tirhut) | 845103 |
| Silautia, Tirhut) | 845103 |
| Singahi, Tirhut) | 845103, 845106 |
| Siswa, Tirhut) | 845106 |
| Sitalbari, Tirhut) | 845106 |
| Siwrahi, Tirhut) | 845106 |
| Sohsa, Tirhut) | 845106 |
| Sonkhar, Tirhut) | 845106 |
| Taulaha, Tirhut) | 845455 |
| Taulaha Champaran, Tirhut) | 845455 |
| Tribhuwani, Tirhut) | 845106 |