Zanjan's 2021 population is now estimated at 477,098. In 1950, the population of Zanjan was 41,029. Zanjan has grown by 9,638 since 2015, which represents a 2.06% 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 Zanjan, which typically includes Zanjan's population in addition to adjacent suburban areas.