Sejong Population 2026

Sejong has a population of 394,630, making it the #25 biggest city in 🇰🇷 South Korea, located in Sejong-si. Roughly 0.8% of South Korea's population lives here. It is about 26× smaller than Seoul, the country's biggest city.

Location of Sejong (capital Seoul shown for reference). Boundaries: Natural Earth.

Population (city proper)

394,630

Rank in South Korea

#25

Coordinates

36.59°N, 127.29°E

~49 m elevation · Asia/Seoul

Distance to capital (Seoul)

112 km

70 miles, straight line

Cities near Sejong

Cheongju-si852,147 people · ~18 km away
Gongju72,435 people · ~21 km away
Cheonan658,831 people · ~27 km away
Daejeon1,441,203 people · ~28 km away
Chinch'ŏn60,964 people · ~32 km away
Asan97,749 people · ~33 km away

FAQ

What is the population of Sejong?

Sejong has a population of 394,630 (city proper, latest official figure via GeoNames), making it the #25 biggest city in South Korea.

What region is Sejong in?

Sejong is located in Sejong-si, South Korea.

Is Sejong the capital of South Korea?

No, the capital of South Korea is Seoul, about 112 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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