Upper Assam division

Upper Assam is an administrative division of the state of Assam comprising the undivided Lakhimpur and Sivasagar (previously, Sibsagar) districts, of the upper reaches of the Brahmaputra valley. The other divisions are: Lower Assam, North Assam and Hills and Barak Valley. The division is under the jurisdiction of a Commissioner, stationed at Jorhat.

Consisting of 7 districts initially, the Upper – Assam division now contains 10 districts, that includes Biswanath, Jorhat, Dibrugarh, Dhemaji, Golaghat, Charaideo, Lakhimpur, Majuli, Sivasagar, and Tinsukia. While Charaideo and Majuli are the newest districts that were raised to district status in 2016, Golaghat and Tinsukia are the biggest districts in terms square kilometre area in the region, raised to the district status in the years of 1987 and 1989 respectively.

Dibrugarh, Golaghat and Jorhat are also the oldest recognised and constantly inhabited urban centres (municipal areas) in the region based on the earliest years of formation of the civic bodies, constituted before the Indian independence of 1947.

An extended list of Upper – Assam region also includes the districts of Sonitpur, Karbi Anglong & Nagaon. The region is the most productive part of the state of Assam, which is rich in natural resources like coal, oil and natural gas as well as tea plantations.

Chutia Kingdom
The medieval Chutia Kingdom was on the bank of the river Brahmaputra. It was a powerful kingdom which had ruled in northeastern Assam and some areas of present-day Arunachal Pradesh, with the capital at Sadiya. The kingdom controlled almost the entire region of present Assam districts of Lakhimpur, Dhemaji, Tinsukia and Dibrugarh as well as parts of Sonitpur, Golaghat, Jorhat and Sibsagar districts. In Arunachal Pradesh, it covered the districts bordering Assam.

Ahom Kingdom
The Ahom Kingdom was a kingdom in the Brahmaputra valley in Assam that maintained its sovereignty for nearly 600 years and successfully resisted Mughal expansion in North-East India. Established by Sukaphaa, a Tai prince from Mong Mao, it began as a Mong in the upper reaches of the Brahmaputra river. It expanded suddenly under Suhungmung in the 16th century after annexing the Chutia kingdom and parts of Kachari kingdom and therefore became multi-ethnic in character. The kingdom became weaker with the rise of the Moamoria rebellion, and subsequently fell to a succession of Burmese invasions. With the defeat of the Burmese after the First Anglo-Burmese War and the Treaty of Yandabo in 1826, control of the kingdom passed into British (East India Company) hands.

Demographics
The Upper Assam division, comprising 24 percent of Assam's population at 7.56 million, predominantly adheres to Hinduism, with Islam being the second most practiced religion, embraced by over 80 percent of its people. More than 60 percent of the people speak Assamese with a sizeable Bengali and Hindi minority. The major communities of Upper assam are Ahom, Chutia, Tea tribes, Mishing, Sonowal Kacharis, Moran, Matak, Deori, Thengal Kacharis and indigenous Assamese Muslim communities like Gorias Morias.