The district's name Dhemaji is derived from the Deori-Chutia word Dema-ji which means great water.

[2] According to the History of Hsenwi state chronicle and Mengguo Zhanbi, in 1318, Si Kefa, the ruler of Mongmao appointed his brother Sanlongfa as the general and led an army of 90,000 to attack the king of Mong Wehsali Long (Assam).

In the end, he designed a plan to make Mong Wehsali Long surrender and pay tribute every 3 years.

Monuments built during the Chutia rule include the Malinithan, Garakhia Than, Bordoloni Than and Basudev temples.

[6] It is one of the fastest developing districts of India, and located at the easternmost part of Assam.

The Bogibil project was running nearest to these place and is completed which connects Dibrugarh.

[15] According to the 2011 census, 39.21% of the district's population speaks Assamese, 32.53% Mising, 9.80% Bengali, 6.95% Boro, 5.26% Nepali, 1.49% Hindi and 0.95% Hajong as their first language.

[12] In 1996 Dhemaji district became home to the Bardoibum-Beelmukh Wildlife Sanctuary, which has an area of 11 km2 (4.2 sq mi).