Ruiru's 2025 population is now estimated at 484,702. In 1950, the population of Ruiru was 676. Ruiru has grown by 20,124 in the last year, which represents a 4.33% 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 Ruiru, which typically includes Ruiru's population in addition to adjacent suburban areas.