Islampur

Demographic profile

There were a total of 300911 registered voters on the electoral rolls for the 2025 Assembly election in Islampur Assembly constituency, of which 160146 were male, 140762 female and 3 of the third gender. In the 2020 Assembly elections, there were a total of 293139 registered voters, of which 156547 were male, 136583 female and 9 from the third gender. In the 2015 Assembly elections, there were a total of 270550 registered voters, of which 144563 were male, 125978 female and 533 from the third gender. In 2010 elections, there were a total of 237595 registered voters in this constituency, of which 127124 were male and 110471 female and 286 from the third gender.

The number of service voters in this Assembly constituency was 1015 in 2020, 9 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 879, in 2020 it was 872, 871 in 2015, and 869 in 2010.

Poll dates

Islampur 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 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 3 on Wednesday, October 28, 2015 and the results were declared on Sunday, November 8, 2015.

In the 2010 polls, this constituency voted in Phase 5 on Tuesday, November 9, 2010 and the results were declared on Wednesday, November 24, 2010.

Extent

Assembly constituency no.174. Islampur comprises of the following areas of Nalanda district in the Magadh region of Bihar: CD Blocks Islampur & Ekangarsarai.

This constituency covers an approximate area of 345.65 square kilometers and the geographic coordinates of Islampur is: 25°09'14.4"N 85°14'29.8"E.

A total of four Assembly constituencies in the state of Bihar share borders with Islampur constituency, which are: Hilsa, Nalanda, Atri, Ghosi. This constituency shares an inter-state border with .

Voter turnout

According to data released by the Election Commission of India, in the 2025 Bihar Assembly elections, the estimated voter turnout in this Islampur constituency was 61.51%. In 2020, this seat registered a turnout of 55.91%, while it was 53.06% in 2015, and 48.15% in 2010.

Total voters

Victory margin

In the 2020 Bihar Assembly elections, Rakesh Kumar Roushan of RJD won in this constituency beating Chandra Sen Prasad of JDU by a margin of 3698 votes which was 2.26% of the total votes cast. In 2015, Chandrasen Prasad of JDU was the winner in this seat beating Birendra Gope of BJP by a margin of 22602 votes which was 15.75% of the total votes polled in the constituency. In the 2010 Assembly elections, Rajib Ranjan of JDU won this seat defeating Virendra Gop of RJD by a margin of 23808 votes which was 20.81% of the total votes polled for the seat.

Winner vote share (%)

In the 2020 Bihar Assembly elections, Rakesh Kumar Roushan of RJD had a vote share of 41.65% in this seat. In the 2015 Assembly elections, Chandrasen Prasad of JDU got a vote share of 46.4% , In the 2010 Assembly elections, Rajib Ranjan of JDU got a vote share of 49.24% in Islampur.