한국어

Population of Sejong

Resident registration data, June 2026 (MOIS)

Total population390,923people
Average age39.4yrs

Population structure

Population by age

10-year bands · by sex

Population by age and sex

Unit: people

Under 1010s20s30s👑 40s50s60s70s80s90s100+18,96727,50018,69228,18436,97531,16819,7749,8393,206419718,34926,72417,48028,69438,68928,98120,02910,6195,1521,44728

Male 194,731Female 196,192

Age structure

Unit: %

Youth 16.5%Working age 70.6%Seniors 12.9%16.5%70.6%12.9%

Youth 16.5%Working age 70.6%Seniors 12.9%

40s is the largest group, at 75,664 people.

Population change

Change over time

4-year trend

Unit: people

380,215 in 2022386,126 in 2023387,940 in 2024392,223 in 2025390,923 in 202620222023202420252026

380,215 in 2022390,923 in 2026

Up 2.8% over the past 4 years.

Population ranking

Jochiwon-eup has the largest population of the 29 neighborhoods.

Population by region

29
  • YoungestHapgang-dong28.5 yrs
  • OldestSejong-dong61 yrs

There is a 32.5-year gap in average age between the youngest and the oldest area.

RegionPopulationShareAverage age
Jochiwon-eup41,02310.5%45.5 yrs
Goun-dong35,1729%37.1 yrs
Dajeong-dong27,8447.1%36.2 yrs
Jongchon-dong27,2327%38.4 yrs
Saerom-dong26,2576.7%36 yrs
Dodam-dong24,4066.2%39.2 yrs
Areum-dong22,8925.9%36.6 yrs
Sodam-dong21,4015.5%36.7 yrs
Boram-dong18,6844.8%37.1 yrs
Hansol-dong17,6464.5%38.7 yrs
Bangok-dong15,2903.9%36.2 yrs
Sanul-dong14,1703.6%31.7 yrs
Jiphyeon-dong13,2333.4%32.2 yrs
Naseong-dong12,9783.3%34.5 yrs
Eojin-dong11,2022.9%34.8 yrs
Daepyeong-dong11,0192.8%39.3 yrs
Haemil-dong9,9182.5%34.3 yrs
Geumnam-myeon8,0152.1%55.9 yrs
Janggun-myeon6,5521.7%51.3 yrs
Yeonseo-myeon6,3221.6%54.8 yrs
Bugang-myeon5,1561.3%53.3 yrs
Jeonui-myeon4,7421.2%56.7 yrs
Jeondong-myeon2,9110.7%60.3 yrs
Yeondong-myeon2,6040.7%59.3 yrs
Yeongi-myeon2,3840.6%53.4 yrs
Sojeong-myeon1,8650.5%56.2 yrs
Hapgang-dong20%28.5 yrs
Sejong-dong20%61 yrs
Nuri-dong10%49 yrs

The top three areas hold 26.6% of the population of Sejong.

Other regions

Other regions

16

Frequently asked questions❓

Sejong has 390,923 residents as of June 2026., 1,300 fewer than a year earlier.
Jochiwon-eup, home to 41,023 residents — 10.5% of Sejong.
It is 39.4 as of June 2026., 6.2 years below the national average of 45.6. Among its neighborhoods, Hapgang-dong is youngest at 28.5 and Sejong-dong oldest at 61.
It rose 2.8% over 4 years, from 380,215 in 2022 to 390,923 in June 2026.
This is resident registration data from Korea's Ministry of the Interior and Safety. Figures are as of the end of June 2026 and are updated monthly. The data is open under KOGL Type 1.
Resident registration counts people at their registered address. The census counts them where they actually live. The gap is widest in university towns and industrial areas, where many people never change their registered address.

Sources 🌐