Changyi's 2021 population is now estimated at 505,019. In 1950, the population of Changyi was 3,097. Changyi has grown by 22,992 since 2015, which represents a 4.77% 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 Changyi, which typically includes Changyi's population in addition to adjacent suburban areas.