The Rajpur Vidhan Sabha constituency, falling under the Lok Sabha seat of Buxar, has been held by the Janata Dal (United) since 2005. The assembly seat was formed in 1977 and has been held by BJP two times, the only party to win elections more than one time other than JD(U). 

The Rajpur assembly seat is currently held by Santosh Kumar Nirala of JD(U) who defeated Bishwanath Ram of BJP by 32,788 votes. Nirala has been holding the seat since 2010. Nirala was earlier defeated by her own party candidate Shyama Payari Devi in 2005. 

As per the recommendations of the Delimitation Commission of India in 2008, the Rajpur assembly segment comprises of Dumraon, Rajpur and Itarhi community development block and Ataon, Kanjharua, Mathila, Mugaon, Kasian and Koran Sarai gram panchayats

Here are a few details about the Rajpur assembly seat:

Name of the assembly constituency, district: Rajpur, Buxar

Lok Sabha constituency: Buxar

Polling Date: October 28, 2020

2020 winner:Vishwanath Ram

2020 runner up: Santosh Kumar Nirala (JD(U))

2015 winner: Santosh Kumar Nirala (JD(U))

2015 runner up: Bishwanath Ram (BJP)

Sitting MLA, party: Santosh Kumar Nirala, JD(U)

Winning margin in 2015:  32,788

Number of voters in 2015:176,159

Percentage of votes polled in 2015: 57.34%

Number of women voters in 2015: 80,583

Number of polling booths in 2015: 306