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Population of Seodaemun-gu, Seoul

Resident registration data, June 2026 (MOIS)

Total population299,810people
Average age45.1yrs

Population structure

Population by age

10-year bands · by sex

Population by age and sex

Unit: people

Under 1010s20s30s40s👑 50s60s70s80s90s100+7,63910,70120,01722,30020,45622,89119,72511,4305,331687117,24410,99724,43323,19421,15324,41522,11814,8748,5751,57541

Male 141,189Female 158,621

Age structure

Unit: %

Youth 8.6%Working age 70.3%Seniors 21.2%70.3%21.2%

Youth 8.6%Working age 70.3%Seniors 21.2%

50s is the largest group, at 47,306 people.

Population change

Change over time

4-year trend

Unit: people

305,623 in 2022308,122 in 2023305,369 in 2024301,034 in 2025299,810 in 202620222023202420252026

305,623 in 2022299,810 in 2026

Down 1.9% over the past 4 years.

Population ranking

Hongje-dong has the largest population of the 20 neighborhoods.

Population by region

20
  • YoungestDaehyeon-dong34.4 yrs
  • OldestOkcheon-dong51.2 yrs

There is a 16.8-year gap in average age between the youngest and the oldest area.

RegionPopulationShareAverage age
Hongje-dong53,21617.7%47.4 yrs
Hongeun-dong50,36916.8%46.8 yrs
Bukgajwa-dong46,58515.5%47 yrs
Namgajwa-dong45,54115.2%42.6 yrs
Yeonhui-dong33,03011%44.3 yrs
Bugahyeon-dong26,7738.9%44.2 yrs
Changcheon-dong10,8323.6%38.4 yrs
Daehyeon-dong6,9972.3%34.4 yrs
Hyeonjeo-dong4,9361.6%47.9 yrs
Chungjeongno3-ga4,7331.6%45.6 yrs
Cheonyeon-dong4,4621.5%44.9 yrs
Naengcheon-dong3,0031%44.5 yrs
Yeongcheon-dong2,9251%46.7 yrs
Daesin-dong1,5790.5%36.5 yrs
Chungjeongno2-ga1,1340.4%45.4 yrs
Hap-dong1,1070.4%40.1 yrs
Okcheon-dong9200.3%51.2 yrs
Sinchon-dong8880.3%38.5 yrs
Migeun-dong4260.1%49.6 yrs
Bongwon-dong3540.1%48.9 yrs

The top three areas hold 50.1% of the population of Seodaemun-gu, Seoul.

Other regions

Other districts in Seoul

16

Frequently asked questions❓

Seodaemun-gu, Seoul has 299,810 residents as of June 2026., 1,224 fewer than a year earlier.
Hongje-dong, home to 53,216 residents — 17.7% of Seodaemun-gu, Seoul.
It is 45.1 as of June 2026., 0.5 years below the national average of 45.6. Among its neighborhoods, Daehyeon-dong is youngest at 34.4 and Okcheon-dong oldest at 51.2.
It fell 1.9% over 4 years, from 305,623 in 2022 to 299,810 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 🌐