Ruian's 2021 population is now estimated at 1,208,306. In 1950, the population of Ruian was 6,827. Ruian has grown by 39,323 since 2015, which represents a 3.36% 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 Ruian, which typically includes Ruian's population in addition to adjacent suburban areas.