Sumquayit's 2021 population is now estimated at 358,675. In 1950, the population of Sumquayit was 20,232. Sumquayit has grown by 4,589 since 2015, which represents a 1.30% 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 Sumquayit, which typically includes Sumquayit's population in addition to adjacent suburban areas.