Arusha's 2021 population is now estimated at 504,857. In 1950, the population of Arusha was 6,069. Arusha has grown by 11,938 since 2015, which represents a 2.42% 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.