In 2015 Bihar Legislative Assembly election, Siwan will be one of the 36 seats to have VVPAT enabled electronic voting machines.

[1][2] As per Delimitation of Parliamentary and Assembly constituencies Order, 2008, No.

105 Siwan Assembly constituency is composed of the following: Siwan community development block including Siwan Municipal Council; Lakri, Pakri, Aurae, Lakri Dargah, Kailgarh Uttar, Kailgarh Dakhin, Sunderpur and Hathigai gram panchayats of Barharia CD Block.

[3] The former MLA Vyasdev Prasad of BJP had won this particular assembly seat 3 times in a row since 2005.

Present MLA of Siwan is Shri Awadh Bihari Choudhary from RJD elected in 2020.