Barharwa Siwan is a village in Dhaka tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Barharwa Siwan was 5,343 which includes 2,902 males and 2,441 females. Barharwa Siwan covers 446 ha area. Pincode of Barharwa Siwan is N/A.