Purainia is a village in Narkatiaganj tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Purainia was 3,538 which includes 1,831 males and 1,707 females. Purainia covers 168.03 ha area. Pincode of Purainia is N/A.