Jamui is one of the 38 districts of Bihar state, India. The district was formed on 21 February 1991, when it was separated from Munger district. It is located at a longitude of 86° 13’E and the latitude is 24° 55’N.

Various literature indicates the fact that Jamui was known as Jambhiyaagram. According to Jains, the 24th Tirthankara lord Mahavira attained omniscience (Kevala Jnana) in Jambhiyagram situated on the bank of river named Ujjihuvaliya. Another place traced as “Jrimbhikgram” on the bank of Rijuvalika river, resembles Jambhiyagram, Ujjhuvaliya.

Jamui district occupies an area of 3,098 square kilometres (1,196 sq mi), comparatively equivalent to Indonesia’s Yamdena Island.The district has untapped reserves of resources including mica, coal, gold and iron ore.Situated along the Bihar-Jharkhand border, Jamui is dotted with hills and the small retreat town of Simultala falls within the Jhajha block, on the main Delhi-Howrah rail line. The town of Gidhaur, situated 17 kilometres (11 mi) away was the seat of kings during the British Raj and many buildings from the period still survive. Minto Tower in Gidhaur is a prime example of architecture from the period.

In 2006 the Ministry of Panchayati Raj named Jamui one of the country’s 250 most backward districts (out of a total of 640).It is one of the 36 districts in Bihar currently receiving funds from the Backward Regions Grant Fund Programme (BRGF).

According to the 2011 census Jamui district has a population of 1,756,078, roughly equal to the nation of The Gambia or the US state of Nebraska.This gives it a ranking of 273rd in India (out of a total of 640).The district has a population density of 567 inhabitants per square kilometre (1,470/sq mi).Its population growth rate over the decade 2001-2011 was 25.54%.Jamui has a sex ratio of 921 females for every 1000 males, and a literacy rate of 62.16%.

Jamui Railway Station, station code JMU, is one of the major railway stations in Danapur division of East Central Railway. Jamui is connected to metropolitan areas of India, by the Delhi-Kolkata Main Line via Mugalsarai-Patna route which runs along the historic Grand Trunk road.

Jamui Station serves the headquarters of Jamui district in the Indian state of Bihar. Railways and roads are the main means of transport in the region.The Jamui railway station is in Howrah-Patna-Mughalsarai main line. Most of the Patna, Barauni bound express trains coming from Howrah, Sealdah, Ranchi, Tatanagar stop here.