As per Delimitation of Parliamentary and Assembly constituencies Order, 2008, No. 130 Patepur (Vidhan Sabha constituency) is composed of the following: Patepur community development block; Mansinghpur Bijhrauli, Kumar Bajitpur, Raghopur Narsanda, Adalpur, Naree Khurd and Laxmipur Barbatta gram panchayats of Jandaha community development block.
In the 2010 state assembly elections, Mahendra Baitha of BJP won the Patepur assembly seat defeating his nearest rival Prema Chaudhary of RJD. Contests in most years were multi cornered but only winners and runners are being mentioned. Prema Chaudhary of RJD defeated Mahendra Baitha of LJP in October 2005. Mahendra Baitha of LJP defeated Prema Chaudhary of RJD in February 2005. Prema Chaudhary of RJD defeated Mahendra Baitha of JD(U) in 2000. Mahendra Baitha of JD defeated Prema Chaudhary of SAP in 1995. Ram Sundar Das of JD defeated Baleshwar Singh Paswan of Congress in 1990. Baleshwar Singh Paswan of Congress defeated Paltan Ram of LD in 1985. Shiv Nandan Paswan of Janata Party (Secular – Charan Singh) defeated Baleshwar Singh Paswan of Congress in 1980. Paltan Ram of JP defeated Rijahan Ram of CPI in 1977.