Tainan's 2026 population is now estimated at 886,039. In 1950, the population of Tainan was 40,000. Tainan has grown by 5,174 in the last year, which represents a 0.59% 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 Tainan, which typically includes Tainan's population in addition to adjacent suburban areas.