Tainan's 2025 population is now estimated at 880,865. In 1950, the population of Tainan was 40,000. Tainan has grown by 5,473 in the last year, which represents a 0.63% 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.