Gaoyou's 2021 population is now estimated at 527,063. In 1950, the population of Gaoyou was 3,126. Gaoyou has grown by 19,129 since 2015, which represents a 3.77% 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 Gaoyou, which typically includes Gaoyou's population in addition to adjacent suburban areas.