Samastipur is a district in Bihar which is spread over an area of 2904 sq. kms. Samastipur is bounded on the north by the Bagmati River which separates it from Darbhanga district. On the west it is bordered by Vaishali and some part of Muzaffarpur district, on the south by the Ganges, while on its east it has Begusarai and some part of Khagaria district. The district headquarters is located at Samastipur.
Infrastructure wise Samastipur is very strong. It is the Divisional Headquarters of the East Central Railway (ECR). The district has direct train links with Patna, Kolkata, Delhi, Dhanbad, Jamshedpur and other places of importance. National Highway No. 28 passes through the district.
The people The people of Samastipur mainly speak Hindi. According to the 2011 census, Population Density in the District is 1465 per sq.km. and the total population is 4.25 million. The district comprises of 4 sub-divisions, and 20 Blocks. It has one Nagar Parishad(Samastipur) and two Nagar Panchayats (Dalsighsarai & Rosera).