Rajnagar

The geographic coordinates of Rajnagar Assembly constituency are: 26°22'02.3"N 86°09'25.2"E. This constituency falls in Madhubani district of Bihar and in the Mithila region. Rajnagar shares its borders with eight other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Rajnagar are: Babubarhi, Khajauli, Benipatti, Bisfi, Madhubani, Jhanjharpur, Phulparas, Laukaha. This constituency shares an inter-state border with .

There were a total of 311840 registered voters on the electoral rolls for the 2025 Assembly election in Rajnagar Assembly constituency, of which 165078 were male, 146747 female and 15 of the third gender. In the 2020 Assembly elections, there were a total of 331220 registered voters, of which 174361 were male, 156836 female and 23 from the third gender. In the 2015 Assembly elections, there were a total of 296751 registered voters, of which 157997 were male, 138741 female and 152 from the third gender. In 2010 elections, there were a total of 241735 registered voters in this constituency, of which 130911 were male and 110824 female and 97 from the third gender.

The number of service voters in this Assembly constituency was 388 in 2020, 13 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 889, in 2020 it was 899, 878 in 2015, and 847 in 2010.

Rajnagar 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 5 on Thursday, November 5, 2015 and the results were declared on Sunday, November 8, 2015.

In the 2010 polls, this constituency voted in Phase 1 on Thursday, October 21, 2010 and the results were declared on Wednesday, November 24, 2010.

Assembly constituency no.37. Rajnagar comprises of the following areas of Madhubani district in the Mithila region of Bihar: CD Blocks Rajnagar & Andhratharhi.

This constituency covers an approximate area of 317.66 square kilometers and the geographic coordinates of Rajnagar is: 26°22'02.3"N 86°09'25.2"E.

A total of eight Assembly constituencies in the state of Bihar share borders with Rajnagar constituency, which are: Babubarhi, Khajauli, Benipatti, Bisfi, Madhubani, Jhanjharpur, Phulparas, Laukaha. 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 Rajnagar constituency was 60.58%. In 2020, this seat registered a turnout of 52.55%, while it was 52.22% in 2015, and 44.16% in 2010.

In the 2020 Bihar Assembly elections, Dr. Ramprit Paswan of BJP won in this constituency beating Ramawatar Paswan of RJD by a margin of 19121 votes which was 10.99% of the total votes cast. In 2015, Ram Prit Paswan of BJP was the winner in this seat beating Ramawatar Paswan of RJD by a margin of 6242 votes which was 4.03% of the total votes polled in the constituency. In the 2010 Assembly elections, Ram Lakhan Ram Raman of RJD won this seat defeating Ramprit Paswan of BJP by a margin of 2459 votes which was 2.3% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Dr. Ramprit Paswan of BJP had a vote share of 51.42% in this seat. In the 2015 Assembly elections, Ram Prit Paswan of BJP got a vote share of 46.23% , In the 2010 Assembly elections, Ram Lakhan Ram Raman of RJD got a vote share of 38.02% in Rajnagar.