Jamalpur

The geographic coordinates of Jamalpur Assembly constituency are: 25°13'16.3"N 86°29'26.5"E. This constituency falls in Munger district of Bihar and in the Bhagalpur region. Jamalpur shares its borders with four other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Jamalpur are: Munger, Tarpur, Jamai, Suryagarha. This constituency shares an inter-state border with .

There were a total of 327989 registered voters on the electoral rolls for the 2025 Assembly election in Jamalpur Assembly constituency, of which 175015 were male, 152963 female and 11 of the third gender. In the 2020 Assembly elections, there were a total of 325933 registered voters, of which 178495 were male, 147426 female and 12 from the third gender. In the 2015 Assembly elections, there were a total of 296356 registered voters, of which 163199 were male, 133146 female and 258 from the third gender. In 2010 elections, there were a total of 255815 registered voters in this constituency, of which 141421 were male and 114394 female and 615 from the third gender.

The number of service voters in this Assembly constituency was 1853 in 2020, 11 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 826, 816 in 2015, and 809 in 2010.

Jamalpur 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 1 on Wednesday, October 28, 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 4 on Monday, November 1, 2010 and the results were declared on Wednesday, November 24, 2010.

Assembly constituency no.166. Jamalpur comprises of the following areas of Munger district in the Bhagalpur region of Bihar: CD Blocks Jamalpur & Dharhara; Gram Panchayats Teliyadih, Naki, Bahira, Agrahan, Badhouna, Gobadda, Kouriya, Baijalpur, Muderi, Rataitha & Barui of Kharagpur CD Block

This constituency covers an approximate area of 455.38 square kilometers and the geographic coordinates of Jamalpur is: 25°13'16.3"N 86°29'26.5"E.

A total of four Assembly constituencies in the state of Bihar share borders with Jamalpur constituency, which are: Munger, Tarpur, Jamai, Suryagarha. 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 Jamalpur constituency was 60.89%. In 2020, this seat registered a turnout of 46.74%, while it was 49.7% in 2015, and 44.86% in 2010.

In the 2020 Bihar Assembly elections, Ajay Kumar Singh of INC won in this constituency beating Shailesh Kumar of JDU by a margin of 4432 votes which was 2.92% of the total votes cast. In 2015, Shailesh Kumar of JDU was the winner in this seat beating Himanshu Kunvar of LJP by a margin of 15476 votes which was 10.51% of the total votes polled in the constituency. In the 2010 Assembly elections, Shailesh Kumar of JDU won this seat defeating Sadhana Devi of LJP by a margin of 21142 votes which was 18.42% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Ajay Kumar Singh of INC had a vote share of 37.65% in this seat. In the 2015 Assembly elections, Shailesh Kumar of JDU got a vote share of 45.68% , In the 2010 Assembly elections, Shailesh Kumar of JDU got a vote share of 42.12% in Jamalpur.