Bathnaha is one of the 243 state assemblies from Bihar. It is located in the Sitamarhi district of the state. Bathnaha constituency seat is reserved for scheduled caste candidates and the current MLA is Anil Kumar of the Bharatiya Janata Party (BJP) who secured 92,648 votes in the 2020 elections, beating Sanjay Ram of the Indian National Congress (INC) by a margin of 46,818 votes.
According to the Election Commission data from 2024, the number of total registered electors in Bathnaha constituency is 325,980. Male electors in this constituency amount to 171,168, female electors amount to 154,801 and 11 electors of the third gender. Data from the last election cycle of 2020 shows the number of total registered at 307,230 where 162,498 electors were male, 144,718 electors were female and 14 electors of the third gender were registered. In the 2015 elections, the number of total registered electors was 276,599 where 145,496 registered electors were male, 131,092 were female and 11 were of the third gender. The 2020 election cycle marked a voter turnout of 55.7% as 171,131 out of the total 307,230 electors cast their votes while in the 2015 elections the voter turnout was 55.06% as 152,304 electors out of 276,599 cast their votes. Polling for this constituency in the upcoming elections will be taken out in the second phase of elections on 11th November 2025.
Bathnaha constituency covers an approximate land area of 342.67 square kilometers and the geographic coordinates of Bathnaha are 26° 42 '54.0"N 85° 30' 24.1"E. A total of five Assembly constituencies in the state of Bihar share borders with Bathnaha constituency, which are: Riga, Sitamarhi, Parihar, Sursand and Bajpatti. This constituency also shares an international border with Nepal.