Tulun is a town in Irkutsk Oblast, Russia, located on the river Iya, 390 kilometers northwest of Irkutsk. Population: 44,611 ; 51,848 ; 52,903…Tulun is a town in Irkutsk Oblast, Russia, located on the river Iya, 390 kilometers northwest of Irkutsk. Population: 44,611 ; 51,848 ; 52,903. It was founded in the second half of the 18th century as a village in the Iya Valley. With the construction of the Trans-Siberian Railway in the early 20th century, Tulun grew into an important trade center. It was administrated as a town between 1922 and 1924, before being granted town status permanently in 1927.