Cotonou's 2026 population is now estimated at 780,456. In 1950, the population of Cotonou was 20,174. Cotonou has grown by 22,467 in the last year, which represents a 2.96% 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 Cotonou, which typically includes Cotonou's population in addition to adjacent suburban areas.