Siswan is a Sub-District (Tehsil/Block/Mandal) in the Siwan District of Bihar. As par Census 2011 information the sub-district code of Siswan is 01247. There are about 19 sub-districts in Siwan and Siswan is one of them. Andar, Barharia, Basantpur, Bhagwanpur Hat, Darauli, Daraundha, Goriakothi, Guthani, Hasanpura, Hussainganj, Lakri Nabiganj, Maharajganj, Mairwa, Nautan, Pachrukhi, Raghunathpur, Siwan, Ziradei etc. are other sub-districts in Siwan.There are about 85 villages in Siswan sub-district, which you can browse from villages list.