There is no official record about the exact date of declaration of the oil town as Duliajan. But it started initially with a nucleus of experienced personnel drawn from the Assam Oil Company (AOC) as well as Burmah Oil Company (BOC), the pioneer organizations of Digboi Oilfield. Oil India formally set up its own organization on 1 January 1962 to look after all aspects of drilling and exploration operations, with its headquarters at Duliajan, then known as Zaloni in the Nahorkatiya area.