Siwan is a Sub-District (Tehsil/Block/Mandal) in the Siwan District of Bihar. As par Census 2011 information the sub-district code of Siwan is 01230. There are about 19 sub-districts in Siwan and Siwan is one of them. Andar, Barharia, Basantpur, Bhagwanpur Hat, Darauli, Daraundha, Goriakothi, Guthani, Hasanpura, Hussainganj, Lakri Nabiganj, Maharajganj, Mairwa, Nautan, Pachrukhi, Raghunathpur, Siswan, Ziradei etc. are other sub-districts in Siwan.There are about 80 villages in Siwan sub-district, which you can browse from villages list.