Ziradei is a Sub-District (Tehsil/Block/Mandal) in the Siwan District of Bihar. As par Census 2011 information the sub-district code of Ziradei is 01239. There are about 19 sub-districts in Siwan and Ziradei is one of them. Andar, Barharia, Basantpur, Bhagwanpur Hat, Darauli, Daraundha, Goriakothi, Guthani, Hasanpura, Hussainganj, Lakri Nabiganj, Maharajganj, Mairwa, Nautan, Pachrukhi, Raghunathpur, Siswan, Siwan etc. are other sub-districts in Siwan.There are about 80 villages in Ziradei sub-district, which you can browse from villages list.