Earlier, Samastipur Judgeship used to function as a sub-division of Darbhanga Judgeship. Later, seeing the mammoth size of the Darbhanga Judgeship and keeping in view the convenience of people, the present Judgeship of Samastipur was created as an independent Judgeship. In the year 1977, in the month of October, Hon'ble Mr. Justice Shambhu Prasad Singh of Hon'ble High Court of Judicature at Patna, inaugurated the Judgeship. It started functioning with all the bonhomie & sobriety at the same time. Further, with the expansion in the number of cases over the period of time another Sub-Division with its court named Rosera was created, which started functioning w.e.f. 16/5/1986 and was situated at Samastipur only. Then after two years, on 20/08/1988 the Rosera Sub-Division was shifted physically to Rosera itself and was inaugurated by the former Hon'ble Mr. Justice R. N. Lal of Hon'ble High Court of Judicature at Patna. On a similar pattern a sub-division, namely 'Dalsingsarai' was also created which started functioning w.e.f. 20/12/86 with its office & court physically situated at Samastipur. Again after 6 years the sub-division court of 'Dalsingsarai was shifted physically to Dalsingsarai on 23/11/2002 and was inaugurated by the Hon'ble Mr. Justice P.K. Dev of Hon'ble High Court of Judicature at Patna. Later on, on account of a nationwide wave of creation of Family Courts, the Judgeship of Samastipur also matched up with the stride of time. A Family Court was established in the year 2005 in the judgeship and was inaugurated by the then Hon'ble Mr. Justice Nagendra Rai, Acting Chief Justice, Hon'ble High Court of Judicature at Patna & Hon'ble Mr. Justice C. M Prasad, Hon'ble High Court of Judicature at Patna on 16/07/05.
Earlier Shahpur Patori Judgeship used to function of Samastipur headquarter. Later keeping in view of the convenience of people, the present judgeship was created as a independent sub-divisional judgeship in 2015 in the month of June by Hon'ble Mr justice L.Narsimbha Reddy.