Seattle's 2021 population is now estimated at 3,460,561. In 1950, the population of Seattle was 795,354. Seattle has grown by 27,617 since 2015, which represents a 0.80% 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 Seattle, which typically includes Seattle's population in addition to adjacent suburban areas.