Bissau's 2021 population is now estimated at 620,974. In 1950, the population of Bissau was 18,336. Bissau has grown by 21,260 since 2015, which represents a 3.55% 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 Bissau, which typically includes Bissau's population in addition to adjacent suburban areas.