Kisumu's 2021 population is now estimated at 366,510. In 1950, the population of Kisumu was 12,103. Kisumu has grown by 11,421 since 2015, which represents a 3.22% 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.