It was reserved for Scheduled castes As a consequence of the orders of the Delimitation Commission of India, Kumarkhand Assembly constituency ceased to exist in 2010.
Amit Kumar Bharti of RJD defeated Nepali Rajak of JD(U) in February 2005.
Bhupendra Rishideo of RJD defeated Amit Kumar Bharti representing JD(U) in 2000.
Upendra Narayan Hazra of JD defeated Janak Ram of Congress in 1995.
Nawal Kishore Bharti of Janata Party (Secular – Charan Singh) defeated Jaikrishna Hazara of Congress in 1980.