Map of Seongnam-si, South Korea

Seongnam-si is a city in Gyeonggi-do, South Korea, with a population of about 914,832. It lies at 37.4386°N, 127.1378°E. Seongnam-si is about 20 km (12 mi) southeast of Seoul, the capital. The nearest city on our map is Gwangju, 11 km to the east.

Seongnam-si at a glance

Where is Seongnam-si?

• The 11th largest city in South Korea by recorded population.
• The 3rd largest city in Gyeonggi-do on this site.
• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 35 min on the shortest day to 14 h 45 min on the longest day (around 21 December and 21 June).

Cities near Seongnam-si

• Gwangju — 11 km east
• Hanam — 13 km northeast
• Guri-si — 18 km north
• Wabu — 18 km northeast
• Gunpo — 19 km southwest
• Anyang-si — 19 km west
• Seoul — 20 km northwest
• Suwon — 20 km southwest
• Namyangju — 23 km north
• Gwangmyeong — 24 km west

Largest cities in Gyeonggi-do

• Suwon — 1,234,582
• Goyang-si — 1,061,752
• Bucheon-si — 850,731
• Hwaseong-si — 640,890
• Ansan-si — 623,256
• Anyang-si — 595,644
• Uijeongbu-si — 479,141
• Pyeongtaek — 364,694
• Gwangmyeong — 357,545
• Gunpo — 286,485

Largest cities in South Korea

• Seoul — 10,349,312
• Busan — 3,285,147
• Incheon — 3,015,482
• Daegu — 2,365,523
• Daejeon — 1,441,203
• Gwangju — 1,401,235
• Suwon — 1,234,582
• Ulsan — 1,098,421
• Goyang-si — 1,061,752
• Changwon — 1,025,702

Map of South Korea and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.