Mairwa (Vidhan Sabha constituency)
It was part of Siwan (Lok Sabha constituency).
In the October 2005 state assembly elections, Ramayan Manjhi of BJP won the Mairwa (SC) assembly seat defeating his nearest rival Satyadeo Ram of CPI(M-L)L. Contests in most years were multi cornered but only winners and runners are being mentioned. Satyadeo Ram of CPI(M-L)L defeated Shiv Kumar Manjhi of RJD in February 2005, Gorakh Ram of Congress in 2000 and Giridhari Ram of CPI(M) in 1995. Gorakh Ram of Congress defeated Giridhari Ram of CPI(M) in 1990 and Independent in 1985. Ram Narain Ram of Congress defeated Giridhari Ram of CPI(M) in 1980. Phul Chand Ram of JP defeated Ram Narain Ram of Congress in 1977.
- "Schedule – XIII of Constituencies Order, 2008 of Delimitation of Parliamentary and Assembly constituencies Order, 2008 of the Election Commission of India" (PDF). Schedule VI Bihar, Part A – Assembly constituencies, Part B – Parliamentary constituencies. Retrieved 2011-01-10.
- "30 - Mairwa (SC) Assembly Constituency". Partywise Comparison Since 1977. Election Commission of India. Retrieved 2011-02-25.