Sanya's 2021 population is now estimated at 644,727. In 1950, the population of Sanya was 3,134. Sanya has grown by 19,437 since 2015, which represents a 3.11% 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 Sanya, which typically includes Sanya's population in addition to adjacent suburban areas.