Mohiuddinnagar

The geographic coordinates of Mohiuddinnagar Assembly constituency are: 25°33'18.7"N 85°38'37.3"E. This constituency falls in Samastipur district of Bihar and in the Mithila region. Mohiuddinnagar shares its borders with seven other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Mohiuddinnagar are: Morwa, Sarairanjan, Mahnar, Bachhwara, Mokama, Barh, Bakhtiarpur. This constituency shares an inter-state border with .

There were a total of 258318 registered voters on the electoral rolls for the 2025 Assembly election in Mohiuddinnagar Assembly constituency, of which 137398 were male, 120916 female and 4 of the third gender. In the 2020 Assembly elections, there were a total of 264479 registered voters, of which 142477 were male, 121992 female and 10 from the third gender. In the 2015 Assembly elections, there were a total of 237075 registered voters, of which 128567 were male, 108508 female and 605 from the third gender. In 2010 elections, there were a total of 199256 registered voters in this constituency, of which 107198 were male and 92058 female and 295 from the third gender.

The number of service voters in this Assembly constituency was 1038 in 2020, 0 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 880, in 2020 it was 856, 844 in 2015, and 859 in 2010.

Mohiuddinnagar 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 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 2 on Sunday, October 24, 2010 and the results were declared on Wednesday, November 24, 2010.

Assembly constituency no.137. Mohiuddinnagar comprises of the following areas of Samastipur district in the Mithila region of Bihar: CD Blocks Mohiuddinnagar & Mohanpur; Gram Panchayats Tara Dhamaun, Uttri Dhamaun, Dakshini Dhamaun, Inayatpur, Hettanpur, Rupauli, Chaksaho, Harpur Saidabad & Seora of Patori CD Block.

This constituency covers an approximate area of 304.91 square kilometers and the geographic coordinates of Mohiuddinnagar is: 25°33'18.7"N 85°38'37.3"E.

A total of seven Assembly constituencies in the state of Bihar share borders with Mohiuddinnagar constituency, which are: Morwa, Sarairanjan, Mahnar, Bachhwara, Mokama, Barh, Bakhtiarpur. 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 Mohiuddinnagar constituency was 70.4%. In 2020, this seat registered a turnout of 56.03%, while it was 52.55% in 2015, and 52.75% in 2010.

In the 2020 Bihar Assembly elections, Rajesh Kumar Singh of BJP won in this constituency beating Ejya Yadav of RJD by a margin of 15114 votes which was 10.2% of the total votes cast. In 2015, Ejya Yadav of RJD was the winner in this seat beating Rajesh Kumar Singh of IND by a margin of 23431 votes which was 18.81% of the total votes polled in the constituency. In the 2010 Assembly elections, Rana Gangeshwar Singh of BJP won this seat defeating Ajay Kumar Bulganin of RJD by a margin of 14351 votes which was 13.65% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Rajesh Kumar Singh of BJP had a vote share of 47.51% in this seat. In the 2015 Assembly elections, Ejya Yadav of RJD got a vote share of 37.83% , In the 2010 Assembly elections, Rana Gangeshwar Singh of BJP got a vote share of 49.24% in Mohiuddinnagar.