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Population of Seosan-si, Chungcheongnam

Resident registration data, June 2026 (MOIS)

Total population171,136people
Average age47.1yrs

Population structure

Population by age

10-year bands · by sex

Population by age and sex

Unit: people

Under 1010s20s30s40s👑 50s60s70s80s90s100+5,1388,6439,07711,21413,18115,92514,2378,2253,41556554,8727,9505,9528,05811,48913,81813,4408,6885,5051,69742

Male 89,625Female 81,511

Age structure

Unit: %

Youth 10.7%Working age 64.8%Seniors 24.5%10.7%64.8%24.5%

Youth 10.7%Working age 64.8%Seniors 24.5%

50s is the largest group, at 29,743 people.

Population change

Change over time

4-year trend

Unit: people

176,416 in 2022176,174 in 2023175,657 in 2024173,253 in 2025171,136 in 202620222023202420252026

176,416 in 2022171,136 in 2026

Down 3% over the past 4 years.

Population ranking

Dongmun-dong has the largest population of the 24 neighborhoods.

Population by region

24
  • YoungestYecheon-dong36.8 yrs
  • OldestPalbong-myeon63.9 yrs

There is a 27.1-year gap in average age between the youngest and the oldest area.

RegionPopulationShareAverage age
Dongmun-dong23,95714%46.9 yrs
Yecheon-dong23,46313.7%36.8 yrs
Seongyeon-myeon17,0269.9%37.3 yrs
Eumnae-dong15,6819.2%45 yrs
Seongnim-dong15,6219.1%42 yrs
Daesan-eup11,8606.9%50.8 yrs
Eumam-myeon8,8105.1%54.5 yrs
Jigok-myeon7,4964.4%51.7 yrs
Haemi-myeon7,0494.1%55.7 yrs
Inji-myeon6,9124%53 yrs
Seongnam-dong5,7423.4%44.1 yrs
Gobuk-myeon5,4203.2%54.6 yrs
Buseok-myeon4,9642.9%63.2 yrs
Unsan-myeon4,8282.8%61.8 yrs
Palbong-myeon3,1841.9%63.9 yrs
Jukseong-dong2,8941.7%46.1 yrs
Galsan-dong1,6281%50.4 yrs
Suseok-dong1,5850.9%55.5 yrs
Yangdae-dong9090.5%56.7 yrs
Onam-dong6640.4%57.6 yrs
Jang-dong4740.3%60.3 yrs
Onseok-dong4330.3%56.6 yrs
Jamhong-dong4060.2%56.3 yrs
Deokjicheon-dong1300.1%62.3 yrs

The top three areas hold 37.7% of the population of Seosan-si, Chungcheongnam.

Other regions

Other districts in Chungcheongnam

15

Frequently asked questions❓

Seosan-si, Chungcheongnam has 171,136 residents as of June 2026., 2,117 fewer than a year earlier.
Dongmun-dong, home to 23,957 residents — 14.0% of Seosan-si, Chungcheongnam.
It is 47.1 as of June 2026., 1.5 years above the national average of 45.6. Among its neighborhoods, Yecheon-dong is youngest at 36.8 and Palbong-myeon oldest at 63.9.
It fell 3% over 4 years, from 176,416 in 2022 to 171,136 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 🌐