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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. Roughly 1.8% of South Korea's population lives here. It is about 11× smaller than Seoul, the country's biggest city.

SeoulSeongnam-si
Location of Seongnam-si (capital Seoul shown for reference). Boundaries: Natural Earth.

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Population (city proper)
914,832
Rank in South Korea
#11
Coordinates
37.44°N, 127.14°E
~80 m elevation · Asia/Seoul
Distance to capital (Seoul)
20 km
12 miles, straight line

Other big cities in Gyeonggi-do

CityPopulationRank in South Korea
Suwon1,234,582#7
Goyang-si1,061,752#9
Bucheon-si850,731#13
Hwaseong-si640,890#15
Ansan-si623,256#17
Anyang-si595,644#18
Uijeongbu-si479,141#22
Pyeongtaek364,694#26

Cities near Seongnam-si

  • Gwangju81,780 people · ~11 km away
  • Hanam254,415 people · ~13 km away
  • Guri-si195,236 people · ~18 km away
  • Wabu96,775 people · ~18 km away
  • Gunpo286,485 people · ~19 km away
  • Uiwang63,040 people · ~19 km away

FAQ

What is the population of Seongnam-si?
Seongnam-si has a population of 914,832 (city proper, latest official figure via GeoNames), making it the #11 biggest city in South Korea.
What region is Seongnam-si in?
Seongnam-si is located in Gyeonggi-do, South Korea.
Is Seongnam-si the capital of South Korea?
No, the capital of South Korea is Seoul, about 20 km away.

Sources & notes

Population refers to the city proper (municipal boundaries), not the metropolitan area. Source: GeoNames (CC BY 4.0), retrieved 2026-07-07. Country data: UN World Population Prospects 2024.

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