Arusha's 2026 population is now estimated at 599,979. In 1950, the population of Arusha was 6,069. Arusha has grown by 23,988 in the last year, which represents a 4.16% 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 Arusha, which typically includes Arusha's population in addition to adjacent suburban areas.