Surat Thani's 2021 population is now estimated at 502,564. In 1950, the population of Surat Thani was 15,628. Surat Thani has grown by 6,596 since 2015, which represents a 1.33% 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 Surat Thani, which typically includes Surat Thani's population in addition to adjacent suburban areas.