Seongnam's 2023 population is now estimated at 941,508. In 1950, the population of Seongnam was 54,507. Seongnam has grown by -61 in the last year, which represents a -0.01% 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 Seongnam, which typically includes Seongnam's population in addition to adjacent suburban areas.