Block
The district of Samastipur came into existance in 14th Nov. 1972 carved out of the erstwhile Darbhanga district. The present district of Samastipur consists of 4 subdivisions. The district has 20 CD blocks, 3 Nagar Parishad/Nagar Panchayat, 381 panchayats and 1260 revenue villages with district headquarter at Samastipur. Samastipur district is a part of Darbhanga commissionary.
Sl.noSub-DivisionBlock
| 1. | Samastipur | Samastipur |
| 2. | Samastipur | Tajpur |
| 3. | Samastipur | Morwa |
| 4. | Samastipur | Khanpur |
| 5. | Samastipur | Sarairanjan |
| 6. | Samastipur | Pusa |
| 7. | Samastipur | Warishnagar |
| 8. | Samastipur | Kalyanpur |
| 9. | Rosera | Rosera |
| 10. | Rosera | Hasanpur |
| 11. | Rosera | Bithan |
| 12. | Rosera | Shivajinagar |
| 13. | Rosera | Singhiya |
| 14. | Rosera | Bibhutipur |
| 15. | Dalsingsarai | Dalsingsarai |
| 16. | Dalsingsarai | Ujiyarpur |
| 17. | Dalsingsarai | Vidyapatinagar |
| 18. | Patori | Patori |
| 19. | Patori | Mohanpur |
| 20. | Patori | Mohiuddin Nagar |