Dumarahar is a village in Dudhi tehsil in district of Sonbhadra, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Dumarahar was 1,339 which includes 668 males and 671 females. Dumarahar covers 969.12 ha area. Pincode of Dumarahar is 231223.