Dongtai's 2021 population is now estimated at 698,218. In 1950, the population of Dongtai was 3,139. Dongtai has grown by 21,222 since 2015, which represents a 3.13% 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 Dongtai, which typically includes Dongtai's population in addition to adjacent suburban areas.