Arusha's 2025 population is now estimated at 575,991. In 1950, the population of Arusha was 6,069. Arusha has grown by 21,594 in the last year, which represents a 3.9% 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.