Kokrajhar is a town in the Bodoland Territorial Region, an autonomous territory in Assam, one of the North Eastern states of India. From early 17th-century present-day Kokrajhar district was under the control of Kingdom of Bhutan, till the Duar Wars in 1865 when British removed the Bhutanese influence and later the areas were merged to undivided Gā¦Kokrajhar is a town in the Bodoland Territorial Region, an autonomous territory in Assam, one of the North Eastern states of India. From early 17th-century present-day Kokrajhar district was under the control of Kingdom of Bhutan, till the Duar Wars in 1865 when British removed the Bhutanese influence and later the areas were merged to undivided Goalpara district of the Indian Union in 1949.