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, 381 panchayats and 1260 revenue villages with district headquarter at Samastipur. Samastipur district is a part of Darbhanga Division. Sub-Division
1. Samastipur
2. Dalsingsarai
3. Rosera
4. Patori