Sonbarsha

The geographic coordinates of Sonbarsha Assembly constituency are: 25°44'07.1"N 86°45'37.8"E. This constituency falls in Saharsa district of Bihar and in the Koshi region. Sonbarsha shares its borders with six other Assembly constituencies. Other Bihar Assembly constituencies adjacent to Sonbarsha are: Bihariganj, Madhepura, Saharsa, Simri Bakhtiarpur, Barari, Beldaur. This constituency shares an inter-state border with .

There were a total of 300818 registered voters on the electoral rolls for the 2025 Assembly election in Sonbarsha Assembly constituency, of which 157848 were male, 142969 female and 1 of the third gender. In the 2020 Assembly elections, there were a total of 313357 registered voters, of which 162103 were male, 151249 female and 5 from the third gender. In the 2015 Assembly elections, there were a total of 283053 registered voters, of which 146680 were male, 136369 female and 81 from the third gender. In 2010 elections, there were a total of 229264 registered voters in this constituency, of which 120563 were male and 108701 female and 70 from the third gender.

The number of service voters in this Assembly constituency was 201 in 2020, 4 in 2015, and 0 in 2010.

The electorate gender ratio (number of female voters per 1000 male voters) in this constituency in 2025 was 906, in 2020 it was 933, 930 in 2015, and 902 in 2010.

Sonbarsha 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 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.74. Sonbarsha comprises of the following areas of Saharsa district in the Koshi region of Bihar: CD Blocks Patarghat, Sonbarsha & Banma Itahri.

This constituency covers an approximate area of 396.42 square kilometers and the geographic coordinates of Sonbarsha is: 25°44'07.1"N 86°45'37.8"E.

A total of six Assembly constituencies in the state of Bihar share borders with Sonbarsha constituency, which are: Bihariganj, Madhepura, Saharsa, Simri Bakhtiarpur, Barari, Beldaur. 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 Sonbarsha constituency was 68.3%. In 2020, this seat registered a turnout of 54.1%, while it was 52.59% in 2015, and 52.21% in 2010.

In the 2020 Bihar Assembly elections, Ratnesh Sada of JDU won in this constituency beating Tarni Rishideo of INC by a margin of 13466 votes which was 8% of the total votes cast. In 2015, Ratnesh Sada of JDU was the winner in this seat beating Sarita Devi of LJP by a margin of 53763 votes which was 36.12% of the total votes polled in the constituency. In the 2010 Assembly elections, Ratnesh Sada of JDU won this seat defeating Sarita Devi of LJP by a margin of 31445 votes which was 26.3% of the total votes polled for the seat.

In the 2020 Bihar Assembly elections, Ratnesh Sada of JDU had a vote share of 40.2% in this seat. In the 2015 Assembly elections, Ratnesh Sada of JDU got a vote share of 59.66% , In the 2010 Assembly elections, Ratnesh Sada of JDU got a vote share of 47.37% in Sonbarsha.