Xinzhu's 2021 population is now estimated at 454,257. In 1950, the population of Xinzhu was 46,438. Xinzhu has grown by 3,737 since 2015, which represents a 0.83% 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 Xinzhu, which typically includes Xinzhu's population in addition to adjacent suburban areas.