As a consequence of the orders of the Delimitation Commission of India, Kishanganj Assembly constituency ceased to exist in 2010.
In the October 2005 and February 2005 state assembly elections, Renu Kumari of JD(U) won the Kishanganj assembly seat defeating her nearest rival Prof. Rabindra Charan Yadav, Independent/ RJD.
Contests in most years were multi cornered but only winners and runners are being mentioned.
Singheshwar Mehta of Congress defeated Rajnandan Prasad of Janata Party (Secular – Charan Singh) in 1980.
Rajnandan Prasad of JP defeated Bishnudeo Singh, Independent, in 1977.