Seongnam-si Population 2026
Seongnam-si has a population of 914,832, making it the #11 biggest city in 🇰🇷 South Korea, located in Gyeonggi-do. Figure refers to the city proper (source: GeoNames).
Population
914,832
Rank in South Korea
#11
State/region
Gyeonggi-do
Timezone
Asia/Seoul