Nathnagar is a Sub-District (Tehsil/Block/Mandal) in the Bhagalpur District of Bihar. As par Census 2011 information the sub-district code of Nathnagar is 01339. There are about 16 sub-districts in Bhagalpur and Nathnagar is one of them. Bihpur, Colgong, Gopalpur, Goradih, Ismailpur, Jagdishpur, Kharik, Narayanpur, Naugachhia, Pirpainti, Rangra Chowk, Sabour, Shahkund, Sonhaula, Sultanganj etc. are other sub-districts in Bhagalpur.There are about 114 villages in Nathnagar sub-district, which you can browse from villages list.