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.