Kalyanpur (Samastipur)

The geographic coordinates of Kalyanpur Assembly constituency are: 25°58'47.3"N 85°45'58.0"E. This constituency falls in Samastipur district of Bihar and in the Mithila region. Kalyanpur shares its borders with seven other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Kalyanpur are: Patepur, Sakra, Samastipur, Warisnagar, Hayaghat, Gaighat, Bahadurpur. This constituency shares an inter-state border with .

There were a total of 323190 registered voters on the electoral rolls for the 2025 Assembly election in Kalyanpur (Samastipur) Assembly constituency, of which 170877 were male, 152308 female and 5 of the third gender. In the 2020 Assembly elections, there were a total of 324420 registered voters, of which 172305 were male, 152103 female and 12 from the third gender. In the 2015 Assembly elections, there were a total of 293518 registered voters, of which 157312 were male, 136203 female and 416 from the third gender. In 2010 elections, there were a total of 251194 registered voters in this constituency, of which 133787 were male and 117407 female and 355 from the third gender.

The number of service voters in this Assembly constituency was 281 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 891, in 2020 it was 883, 866 in 2015, and 878 in 2010.

Kalyanpur (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.131. Kalyanpur comprises of the following areas of Samastipur district in the Mithila region of Bihar: CD Blocks Kalyanpur & Pusa.

This constituency covers an approximate area of 314.21 square kilometers and the geographic coordinates of Kalyanpur is: 25°58'47.3"N 85°45'58.0"E.

A total of seven Assembly constituencies in the state of Bihar share borders with Kalyanpur constituency, which are: Patepur, Sakra, Samastipur, Warisnagar, Hayaghat, Gaighat, Bahadurpur. 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 Kalyanpur (Samastipur) constituency was 73.62%. In 2020, this seat registered a turnout of 57.93%, while it was 57.4% in 2015, and 51.34% in 2010.

In the 2020 Bihar Assembly elections, Maheshwar Hazari of JDU won in this constituency beating Ranjeet Kumar Ram of CPIMLL by a margin of 10251 votes which was 5.45% of the total votes cast. In 2015, Maheshwar Hazari of JDU was the winner in this seat beating Prince Raj of LJP by a margin of 37686 votes which was 22.37% of the total votes polled in the constituency. In the 2010 Assembly elections, Ramsewak Hazari of JDU won this seat defeating Bishwnath Paswan of LJP by a margin of 30197 votes which was 23.42% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Maheshwar Hazari of JDU had a vote share of 38.46% in this seat. In the 2015 Assembly elections, Maheshwar Hazari of JDU got a vote share of 50.4% , In the 2010 Assembly elections, Ramsewak Hazari of JDU got a vote share of 48.17% in Kalyanpur.