Jhajha is a Sub-District (Tehsil/Block/Mandal) in the Jamui District of Bihar. As par Census 2011 information the sub-district code of Jhajha is 01530. There are about 10 sub-districts in Jamui and Jhajha is one of them. Barhat, Chakai, Gidhaur, Islamnagar Aliganj, Jamui, Khaira, Lakshmipur, Sikandra, Sono etc. are other sub-districts in Jamui.There are about 190 villages in Jhajha sub-district, which you can browse from villages list.