Dudhahi is a village in Harsidhi tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Dudhahi was 6,485 which includes 3,411 males and 3,074 females. Dudhahi covers 510.24 ha area. Pincode of Dudhahi is 845422.