Mahnar

The geographic coordinates of Mahnar Assembly constituency are: 25°39'10.8"N 85°30'16.6"E. This constituency falls in Vaishali district of Bihar and in the Tirhut region. Mahnar shares its borders with six other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Mahnar are: Patepur, Mahua, Raja Pakar, Bakhtiarpur, Morwa, Mohiuddinnagar. This constituency shares an inter-state border with .

There were a total of 299836 registered voters on the electoral rolls for the 2025 Assembly election in Mahnar Assembly constituency, of which 158524 were male, 141302 female and 10 of the third gender. In the 2020 Assembly elections, there were a total of 303945 registered voters, of which 163122 were male, 140808 female and 15 from the third gender. In the 2015 Assembly elections, there were a total of 272958 registered voters, of which 147506 were male, 125436 female and 485 from the third gender. In 2010 elections, there were a total of 223157 registered voters in this constituency, of which 121912 were male and 101242 female and 302 from the third gender.

The number of service voters in this Assembly constituency was 1071 in 2020, 16 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 863, 850 in 2015, and 830 in 2010.

Mahnar 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 3 on Thursday, October 28, 2010 and the results were declared on Wednesday, November 24, 2010.

Assembly constituency no.129. Mahnar comprises of the following areas of Vaishali district in the Tirhut region of Bihar: CD Block Mahnar; Gram Panchayats Borhan urf Rasulpur Gaus, Basantpur, Mohiuddinpur Garahi, Harprasad, Mahipura, Sohrathi, Mahisaur, Chandsarai, Dihbuchauli, Peerapur, Rasalpur Purushottam, Bishunpur Bedauliya, Saiyad Mahammad urf Salha, Khopi, Arniyan, Hazrat Jandaha, Bahsi Saidpur, Mukundpur Bhath & Loma of Jandaha CD Block.

This constituency covers an approximate area of 207.79 square kilometers and the geographic coordinates of Mahnar is: 25°39'10.8"N 85°30'16.6"E.

A total of six Assembly constituencies in the state of Bihar share borders with Mahnar constituency, which are: Patepur, Mahua, Raja Pakar, Bakhtiarpur, Morwa, Mohiuddinnagar. 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 Mahnar constituency was 66.12%. In 2020, this seat registered a turnout of 54.58%, while it was 54.42% in 2015, and 53.31% in 2010.

In the 2020 Bihar Assembly elections, Bina Singh of RJD won in this constituency beating Umesh Singh Kushwaha of JDU by a margin of 7947 votes which was 4.81% of the total votes cast. In 2015, Umesh Singh Kushwaha of JDU was the winner in this seat beating Dr Achuta Nand of BJP by a margin of 26455 votes which was 17.85% of the total votes polled in the constituency. In the 2010 Assembly elections, Dr Achyuatanand of BJP won this seat defeating Rama Kishor Singh of LJP by a margin of 2489 votes which was 2.09% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Bina Singh of RJD had a vote share of 37.34% in this seat. In the 2015 Assembly elections, Umesh Singh Kushwaha of JDU got a vote share of 47.12% , In the 2010 Assembly elections, Dr Achyuatanand of BJP got a vote share of 25.01% in Mahnar.