Birnathpur is a village in Barharwa tehsil in district of Sahibganj, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Birnathpur was 1,151 which includes 567 males and 584 females. Birnathpur covers 54.18 ha area. Pincode of Birnathpur is 816101.