Deotar Birnia is a village in Bahadurganj tehsil in district of Kishanganj, Bihar, India. As per the data provided by Census of India in 2011, total population of Deotar Birnia was 3,260 which includes 1,610 males and 1,650 females. Deotar Birnia covers 278 ha area. Pincode of Deotar Birnia is N/A.