List of Sub Districts in Siwan
| ID | States/UTs | Districts | SubDistricts |
|---|---|---|---|
| 1 | Bihar | Siwan | Andar |
| 2 | Bihar | Siwan | Barharia |
| 3 | Bihar | Siwan | Basantpur |
| 4 | Bihar | Siwan | Bhagwanpur Hat |
| 5 | Bihar | Siwan | Darauli |
| 6 | Bihar | Siwan | Daraundha |
| 7 | Bihar | Siwan | Goriakothi |
| 8 | Bihar | Siwan | Guthani |
| 9 | Bihar | Siwan | Hasanpura |
| 10 | Bihar | Siwan | Hussainganj |
| 11 | Bihar | Siwan | Lakri Nabiganj |
| 12 | Bihar | Siwan | Maharajganj |
| 13 | Bihar | Siwan | Mairwa |
| 14 | Bihar | Siwan | Nautan |
| 15 | Bihar | Siwan | Pachrukhi |
| 16 | Bihar | Siwan | Raghunathpur |
| 17 | Bihar | Siwan | Siswan |
| 18 | Bihar | Siwan | Siwan |
| 19 | Bihar | Siwan | Ziradei |