Lakhisarai is one of the 243 state assembly constituencies of Bihar. This constituency is located in the district of the same name. The current MLA from this constituency is Vijay Kumar Sinha of Bharatiya Janata Party (BJP), who secured 74,212 votes in the 2020 elections beating Amaresh Kumar of the Indian National Congress (INC) by a margin of 10,483 votes.

Election Commission data from 2024 shows the total number of registered electors from this constituency at 395,117 electors. Male registered electors in this constituency amount to 210,152, female registered electors in this constituency amount to 184,954 and 11 electors of the third gender are also registered. Data from the last elections in 2020 marked the total number of registered electors at 368,106 where 196,927 electors were male, 171,168 electors were female and 11 electors were of the third gender. 2015 election data from the Election Commission shows the total number of registered electors as 342,838 electors, where 184,119 electors were male, 158,711 electors were female and only 8 electors of the third gender were registered. Voter turnout of 52.8% in the 2020 elections shows that out of the 368,106 electors, 194,353 cast their votes while in 2015 elections, 186,216 out of the 342,838 total registered electors cast their votes making the voter turnout 54.32%. Polling for this constituency in the

Lakhisarai constituency covers an approximate land area of 590.92 square kilometers and the geographic coordinates of Lakhisarai are 25° 05 '59.3"N 86° 01' 56.6"E. Seven assembly constituencies in the state of Bihar share borders with Lakhisarai constituency, which are Matihani, Suryagarha, Jamui, Sikhandra, Sheikhpura, Asthawan and Mokama.