List of Sub Districts in Samastipur
| ID | States/UTs | Districts | SubDistricts |
|---|---|---|---|
| 1 | Bihar | Samastipur | Bithan |
| 2 | Bihar | Samastipur | Warisnagar |
| 3 | Bihar | Samastipur | Hasanpur |
| 4 | Bihar | Samastipur | Kalyanpur |
| 5 | Bihar | Samastipur | Ujiarpur |
| 6 | Bihar | Samastipur | Khanpur |
| 7 | Bihar | Samastipur | Samastipur |
| 8 | Bihar | Samastipur | Patori |
| 9 | Bihar | Samastipur | Mohanpur |
| 10 | Bihar | Samastipur | Mohiuddinagar |
| 11 | Bihar | Samastipur | Shivaji Nagar |
| 12 | Bihar | Samastipur | Pusa |
| 13 | Bihar | Samastipur | Morwa |
| 14 | Bihar | Samastipur | Bibhutpur |
| 15 | Bihar | Samastipur | Tajpur |
| 16 | Bihar | Samastipur | Sarairanjan |
| 17 | Bihar | Samastipur | Dalsinghsarai |
| 18 | Bihar | Samastipur | Vidyapati Nagar |
| 19 | Bihar | Samastipur | Singhia |
| 20 | Bihar | Samastipur | Rosera |