Nautan is a Sub-District (Tehsil/Block/Mandal) in the Siwan District of Bihar. As par Census 2011 information the sub-district code of Nautan is 01229. There are about 19 sub-districts in Siwan and Nautan is one of them. Andar, Barharia, Basantpur, Bhagwanpur Hat, Darauli, Daraundha, Goriakothi, Guthani, Hasanpura, Hussainganj, Lakri Nabiganj, Maharajganj, Mairwa, Pachrukhi, Raghunathpur, Siswan, Siwan, Ziradei etc. are other sub-districts in Siwan.There are about 45 villages in Nautan sub-district, which you can browse from villages list.