Narainapur is a village in Sidhaw tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Narainapur was 1,682 which includes 847 males and 835 females. Narainapur covers 261.4 ha area. Pincode of Narainapur is N/A.