Zanzibar's 2020 population is now estimated at 705,078. In 1950, the population of Zanzibar was 53,530. Zanzibar has grown by 136,166 since 2015, which represents a 4.39% 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 Zanzibar, which typically includes Zanzibar's population in addition to adjacent suburban areas.