Ziyang's 2021 population is now estimated at 514,110. In 1950, the population of Ziyang was 1,619. Ziyang has grown by 14,016 since 2015, which represents a 2.80% 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 Ziyang, which typically includes Ziyang's population in addition to adjacent suburban areas.