Baijnathpur is a village in Chiraia tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Baijnathpur was 4,654 which includes 2,438 males and 2,216 females. Baijnathpur covers 419 ha area. Pincode of Baijnathpur is 845415.