Irkutsk's 2021 population is now estimated at 641,504. In 1950, the population of Irkutsk was 311,044. Irkutsk has grown by 2,661 since 2015, which represents a 0.42% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Irkutsk, which typically includes Irkutsk's population in addition to adjacent suburban areas.