Kisumu's 2026 population is now estimated at 438,588. In 1950, the population of Kisumu was 12,103. Kisumu has grown by 16,440 in the last year, which represents a 3.89% 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 Kisumu, which typically includes Kisumu's population in addition to adjacent suburban areas.