It was constituted as a civil subdivision on 1 June 1869. Subsequently, it was upgraded to district in 1989. It is to be noted that according to some scholars,the name "Hailakandi" has been derived from the Sylheti word "Hailakundi". The later history of Hailakandi is intricately linked to Abdul Matlib Mazumdar (1890–1980). In 1946, when India was still under British rule, he became an MLA and also Cabinet Minister of Assam. He was one of the prominent Muslim leaders of eastern India to support Hindu-Muslim unity, opposing thepartition of India on communal lines. Mazumdar along with Fakhruddin Ali Ahmed (who later became the 5th President of India) became the most prominent Muslim opponents of the demand for a separate Muslim state of Pakistan, especially in the eastern part of the country. Mazumdar took Master of Arts Degree in English literature from Dhaka Universityin 1921 and B.L. from Calcutta in 1924. He started legal practice at Hailakandi Bar in 1925. He rose to prominence as a lawyer serving the people of Hailakandi. The then government offered him the post of a Magistrate, which he refused. He joined the Indian National Congress in 1925. He founded the Hailakandi Congress Committee in 1937 and became its first President. Netaji Subhash Chandra Bose and Pandit Jawaharlal Nehru visited Hailakandi in 1939 and 1945 respectively at the invitation of Mazumdar to strengthen the freedom movement as well as the Congress party in southern Assam. It was Netaji who initiated establishment of contact between Moulana Abul Kalam Azad and Matlib Mazumdar for gearing up nationalist Muslims against a growing Muslim League in the region. Mazumdar became the first Chairman of Hailakandi township in 1939 and in 1945 he became the first Indian Chairman of the Hailakandi Local Board, a post always held by the European tea planters.
The Muslim League proved its might in the Muslim-dominated areas of India in 1937 elections. To counter the rising popularity of Muslim
