Sarairanjan

The geographic coordinates of Sarairanjan Assembly constituency are: 25°41'39.5"N 85°44'18.2"E. This constituency falls in Samastipur district of Bihar and in the Mithila region. Sarairanjan shares its borders with five other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Sarairanjan are: Samastipur, Ujiarpur, Mohiuddinnagar, Morwa, Bachhwara. This constituency shares an inter-state border with .

There were a total of 281039 registered voters on the electoral rolls for the 2025 Assembly election in Sarairanjan Assembly constituency, of which 150354 were male, 130682 female and 3 of the third gender. In the 2020 Assembly elections, there were a total of 281041 registered voters, of which 149961 were male, 131073 female and 7 from the third gender. In the 2015 Assembly elections, there were a total of 256690 registered voters, of which 137225 were male, 119464 female and 612 from the third gender. In 2010 elections, there were a total of 217663 registered voters in this constituency, of which 116280 were male and 101383 female and 438 from the third gender.

The number of service voters in this Assembly constituency was 545 in 2020, 1 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 869, in 2020 it was 874, 871 in 2015, and 872 in 2010.

Sarairanjan 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 3 on Saturday, November 7, 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.136. Sarairanjan comprises of the following areas of Samastipur district in the Mithila region of Bihar: CD Blocks Sarairanjan & Vidyapati Nagar.

This constituency covers an approximate area of 233 square kilometers and the geographic coordinates of Sarairanjan is: 25°41'39.5"N 85°44'18.2"E.

A total of five Assembly constituencies in the state of Bihar share borders with Sarairanjan constituency, which are: Samastipur, Ujiarpur, Mohiuddinnagar, Morwa, Bachhwara. 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 Sarairanjan constituency was 73.33%. In 2020, this seat registered a turnout of 60.91%, while it was 59.33% in 2015, and 54.54% in 2010.

In the 2020 Bihar Assembly elections, Vijay Kumar Choudhary of JDU won in this constituency beating Arbind Kumar Sahni of RJD by a margin of 3624 votes which was 2.12% of the total votes cast. In 2015, Vijay Kumar Choudhary of JDU was the winner in this seat beating Ranjeet Nirguni of BJP by a margin of 34044 votes which was 22.36% of the total votes polled in the constituency. In the 2010 Assembly elections, Vijay Kumar Chaudhary of JDU won this seat defeating Ramashraya Sahni of RJD by a margin of 17557 votes which was 14.79% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Vijay Kumar Choudhary of JDU had a vote share of 42.48% in this seat. In the 2015 Assembly elections, Vijay Kumar Choudhary of JDU got a vote share of 53.23% , In the 2010 Assembly elections, Vijay Kumar Chaudhary of JDU got a vote share of 45.44% in Sarairanjan.