Kalyanpur (Purvi Champaran)

The geographic coordinates of Kalyanpur Assembly constituency are: 26°26'44.2"N 84°52'56.6"E. This constituency falls in Purvi Champaran district of Bihar and in the Tirhut region. Kalyanpur shares its borders with six other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Kalyanpur are: Pipra, Motihari, Harsidhi, Govindganj, Sahebganj, Baruraj. This constituency shares an inter-state border with .

There were a total of 255066 registered voters on the electoral rolls for the 2025 Assembly election in Kalyanpur (Purvi Champaran) Assembly constituency, of which 136443 were male, 118623 female and 0 of the third gender. In the 2020 Assembly elections, there were a total of 256790 registered voters, of which 135455 were male, 121328 female and 7 from the third gender. In the 2015 Assembly elections, there were a total of 226547 registered voters, of which 121234 were male, 105308 female and 32 from the third gender. In 2010 elections, there were a total of 177339 registered voters in this constituency, of which 95197 were male and 82142 female and 29 from the third gender.

The number of service voters in this Assembly constituency was 340 in 2020, 5 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 869, in 2020 it was 896, 869 in 2015, and 863 in 2010.

Kalyanpur (Purvi Champaran) Assembly constituency will go to the polls in Phase 2 of the 2025 Bihar Assembly elections on Tuesday, November 11, 2025. The counting of votes is on Friday, November 14, 2025.

In the 2020 state Assembly elections, this seat voted in Phase 2 on Tuesday, November 3, 2020 and the results were declared on Tuesday, November 10, 2020.

In the 2015 state Assembly elections, this seat voted in Phase 4 on Sunday, November 1, 2015 and the results were declared on Sunday, November 8, 2015.

In the 2010 polls, this constituency voted in Phase 3 on Thursday, October 28, 2010 and the results were declared on Wednesday, November 24, 2010.

Assembly constituency no.16. Kalyanpur comprises of the following areas of Purvi Champaran district in the Tirhut region of Bihar: CD Block Kotwa; Gram Panchayats Parsauni Wazid, Bakhri, Kalyanpur, Barharwa ahanand, Siswa Shobh, Brindaban, Pakari Dixit, Siswa Kharar, Patna, Gariba, Shambhu Chak, Sitalpur, Koela Belwa, Bhuwan Chhapra, Banshghat, North Gawandra, South Gawandra & ani Chhapra of Kalyanpur CD Block.

This constituency covers an approximate area of 314.21 square kilometers and the geographic coordinates of Kalyanpur is: 26°26'44.2"N 84°52'56.6"E.

A total of six Assembly constituencies in the state of Bihar share borders with Kalyanpur constituency, which are: Pipra, Motihari, Harsidhi, Govindganj, Sahebganj, Baruraj. 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 (Purvi Champaran) constituency was 72.41%. In 2020, this seat registered a turnout of 62.54%, while it was 59.83% in 2015, and 54.63% in 2010.

In the 2020 Bihar Assembly elections, Manoj Kumar Yadav of RJD won in this constituency beating Sachindra Prasad Singh of BJP by a margin of 1193 votes which was 0.74% of the total votes cast. In 2015, Sachindra Prasad Singh of BJP was the winner in this seat beating Razia Khatoon of JDU by a margin of 11488 votes which was 8.48% of the total votes polled in the constituency. In the 2010 Assembly elections, Razia Khatoon of JDU won this seat defeating Manoj Kumar Yadav of RJD by a margin of 15402 votes which was 15.9% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Manoj Kumar Yadav of RJD had a vote share of 45.35% in this seat. In the 2015 Assembly elections, Sachindra Prasad Singh of BJP got a vote share of 36.94% , In the 2010 Assembly elections, Razia Khatoon of JDU got a vote share of 42.49% in Kalyanpur.