Rosario's 2021 population is now estimated at 1,553,530. In 1950, the population of Rosario was 554,483. Rosario has grown by 21,402 since 2015, which represents a 1.40% 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 Rosario, which typically includes Rosario's population in addition to adjacent suburban areas.