Unchi Dih is a village in Ramgarhwa tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Unchi Dih was 1,745 which includes 916 males and 829 females. Unchi Dih covers 205.6 ha area. Pincode of Unchi Dih is 845433.