Jamui was formed as a District on 21st February, 1991 when it was separated from Munger.
Its parent district Munger is in North. Giridih and Deoghar district of Jharkhand State in South of Jamui district. It is bound in East by Banka and Deoghar and in the west by Nawada & Giridih. The geographical area of the Jamui district is 3122.80 sq. km. District Jamui has only one Subdivision named Jamui Subdivision. All the 10 Blocks of Jamui Subdivision. The name of 10 Blocks of Jamui are - Jamui, Sikandra, Khaira, Chakai, Sono, Laxmipur, Jhajha, Barhat, Gidhour, Islamnagar Aliganj