Zanzibar's 2025 population is now estimated at 873,982. In 1950, the population of Zanzibar was 53,530. Zanzibar has grown by 38,132 in the last year, which represents a 4.56% 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.