Map of Osan, South Korea

Osan is a city in Gyeonggi-do, South Korea, with a population of about 238,788. It lies at 37.1522°N, 127.0706°E. Osan is about 47 km (29 mi) south of Seoul, the capital. The nearest city on our map is Suwon, 16 km to the north.

Osan at a glance

Where is Osan?

• The 41st largest city in South Korea by recorded population.
• The 13th largest city in Gyeonggi-do on this site.
• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 36 min on the shortest day to 14 h 43 min on the longest day (around 21 December and 21 June).

Cities near Osan

• Suwon — 16 km north
• Pyeongtaek — 18 km south
• Hwaseong-si — 23 km west
• Anseong — 24 km southeast
• Gunpo — 26 km northwest
• Ansan-si — 29 km northwest
• Anyang-si — 30 km northwest
• Seongnam-si — 32 km north
• Gwangju — 33 km northeast
• Icheon-si — 36 km northeast

Largest cities in Gyeonggi-do

• Suwon — 1,234,582
• Goyang-si — 1,061,752
• Seongnam-si — 914,832
• 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

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.