Map of Seosan, South Korea

Seosan is a city in Chungcheongnam-do, South Korea, with a population of about 74,208. It lies at 36.7817°N, 126.4522°E. Seosan is about 99 km (61 mi) southwest of Seoul, the capital. The nearest city on our map is Hongseong, 28 km to the southeast.

Seosan at a glance

Where is Seosan?

• The 5th largest city in Chungcheongnam-do on this site.
• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 38 min on the shortest day to 14 h 41 min on the longest day (around 21 December and 21 June).

Cities near Seosan

• Hongseong — 28 km southeast
• Yesan — 37 km east
• Asan — 49 km east
• Boryeong — 50 km south
• Hwaseong-si — 57 km northeast
• Pyeongtaek — 61 km northeast
• Cheonan — 62 km east
• Ansan-si — 69 km northeast
• Osan — 69 km northeast
• Buyeo — 70 km southeast

Largest cities in Chungcheongnam-do

• Cheonan — 658,831
• Asan — 97,749
• Boryeong — 94,191
• Hongseong — 89,174
• Gongju — 72,435
• Buyeo — 59,823
• Nonsan — 43,845
• Yesan — 39,409

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.