Samastipur

The geographic coordinates of Samastipur Assembly constituency are: 25°52'55.2"N 85°44'51.4"E. This constituency falls in Samastipur district of Bihar and in the Mithila region. Samastipur shares its borders with five other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Samastipur are: Kalyanpur, Warisnagar, Ujaipur, Sarairanjan, Morwa. This constituency shares an inter-state border with .

There were a total of 273491 registered voters on the electoral rolls for the 2025 Assembly election in Samastipur Assembly constituency, of which 145915 were male, 127568 female and 8 of the third gender. In the 2020 Assembly elections, there were a total of 279144 registered voters, of which 149108 were male, 130029 female and 7 from the third gender. In the 2015 Assembly elections, there were a total of 246709 registered voters, of which 133230 were male, 113476 female and 377 from the third gender. In 2010 elections, there were a total of 211653 registered voters in this constituency, of which 114567 were male and 97086 female and 226 from the third gender.

The number of service voters in this Assembly constituency was 380 in 2020, 3 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 874, in 2020 it was 872, 852 in 2015, and 847 in 2010.

Samastipur Assembly constituency will go to the polls in Phase 1 of the 2025 Bihar Assembly elections on Thursday, November 6, 2025. The counting of votes is on Friday, November 14, 2025.

In the 2020 state Assembly elections, this seat voted in Phase 3 on Saturday, November 7, 2020 and the results were declared on Tuesday, November 10, 2020.

In the 2015 state Assembly elections, this seat voted in Phase 1 on Monday, October 12, 2015 and the results were declared on Sunday, November 8, 2015.

In the 2010 polls, this constituency voted in Phase 2 on Sunday, October 24, 2010 and the results were declared on Wednesday, November 24, 2010.

Assembly constituency no.133. Samastipur comprises of the following areas of Samastipur district in the Mithila region of Bihar: CD Block Samastipur & Samastipur (M+OG); Gram Panchayats Shahpur Baghauni, Bherokhara, Tajpur, Adharpur & Baghi of Tajpur CD Block.

This constituency covers an approximate area of 151.82 square kilometers and the geographic coordinates of Samastipur is: 25°52'55.2"N 85°44'51.4"E.

A total of five Assembly constituencies in the state of Bihar share borders with Samastipur constituency, which are: Kalyanpur, Warisnagar, Ujaipur, Sarairanjan, Morwa. This constituency shares an inter-state border with .

According to data released by the Election Commission of India, in the 2025 Bihar Assembly elections, the estimated voter turnout in this Samastipur constituency was 72.12%. In 2020, this seat registered a turnout of 59.56%, while it was 61.3% in 2015, and 55.19% in 2010.

In the 2020 Bihar Assembly elections, Akhtarul Islam Shahin of RJD won in this constituency beating Ashwamedh Devi of JDU by a margin of 4714 votes which was 2.84% of the total votes cast. In 2015, Akhtarul Islam Shaheen of RJD was the winner in this seat beating Renu Kumari of BJP by a margin of 31080 votes which was 20.55% of the total votes polled in the constituency. In the 2010 Assembly elections, Akhtarul Islam Sahin of RJD won this seat defeating Ramnath Thakur of JDU by a margin of 1827 votes which was 1.56% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Akhtarul Islam Shahin of RJD had a vote share of 41.21% in this seat. In the 2015 Assembly elections, Akhtarul Islam Shaheen of RJD got a vote share of 54.56% , In the 2010 Assembly elections, Akhtarul Islam Sahin of RJD got a vote share of 36.69% in Samastipur.