Dhamsayn is a village in Alinagar tehsil in district of Darbhanga, Bihar, India. As per the data provided by Census of India in 2011, total population of Dhamsayn was 8,406 which includes 4,219 males and 4,187 females. Dhamsayn covers 236 ha area. Pincode of Dhamsayn is 847405.