Washington, D.C.'s 2021 population is now estimated at 5,378,377. In 1950, the population of Washington, D.C. was 1,298,286. Washington, D.C. has grown by 56,647 since 2015, which represents a 1.06% 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 Washington, D.C., which typically includes Washington, D.C.'s population in addition to adjacent suburban areas.