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Population of Cheonan-si, Chungcheongnam

Resident registration data, June 2026 (MOIS)

Total population666,182people
Average age42.4yrs

Population structure

Population by age

10-year bands · by sex

Population by age and sex

Unit: people

Under 1010s20s30s40s👑 50s60s70s80s90s100+21,83534,86744,99953,51057,41456,87244,82619,7966,722812920,69933,30239,41044,94051,27354,98543,50522,06311,5102,77755

Male 341,662Female 324,520

Age structure

Unit: %

Youth 11.5%Working age 72.3%Seniors 16.2%11.5%72.3%16.2%

Youth 11.5%Working age 72.3%Seniors 16.2%

50s is the largest group, at 111,857 people.

Population change

Change over time

4-year trend

Unit: people

657,214 in 2022658,932 in 2023658,320 in 2024661,967 in 2025666,182 in 202620222023202420252026

657,214 in 2022666,182 in 2026

Up 1.4% over the past 4 years.

Population ranking

Seobuk-gu has the largest population of the 2 districts.

Population by region

2
RegionPopulationShareAverage age
Seobuk-gu402,52960.4%40.8 yrs
Dongnam-gu263,65339.6%44.8 yrs

The top three areas hold 100.0% of the population of Cheonan-si, Chungcheongnam.

Other regions

Other districts in Chungcheongnam

14

Frequently asked questions❓

Cheonan-si, Chungcheongnam has 666,182 residents as of June 2026., 4,215 more than a year earlier.
Seobuk-gu, home to 402,529 residents — 60.4% of Cheonan-si, Chungcheongnam.
It is 42.4 as of June 2026., 3.2 years below the national average of 45.6. Among its districts, Seobuk-gu is youngest at 40.8 and Dongnam-gu oldest at 44.8.
It rose 1.4% over 4 years, from 657,214 in 2022 to 666,182 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 🌐