Total population666,584people
Households322,436households
Average age42.5yrs
Sex ratioMale341,935peopleFemale324,649people51.3%48.7%
Population change
Change over time
4-year trendUnit: people
657,612 in 2022666,584 in 2026
Up 1.4% over the past 4 years.
Migration
As of August 2026Monthly Overview
Moved in6,263people
Moved out6,243people
Net migration20people
Net migration by month
Unit: people
Net inflowNet outflow
Top origins
Unit: people
| Region | Moved in |
|---|---|
| Asan-si | 459 |
| Pyeongtaek-si, Gyeonggi | 163 |
| Suwon-si, Gyeonggi | 125 |
| Cheongju-si, Chungcheongbuk-do | 115 |
| Hwaseong-si, Gyeonggi | 85 |
Top destinations
Unit: people
| Region | Moved out |
|---|---|
| Asan-si | 875 |
| Pyeongtaek-si, Gyeonggi | 195 |
| Cheongju-si, Chungcheongbuk-do | 125 |
| Suwon-si, Gyeonggi | 105 |
| Hwaseong-si, Gyeonggi | 101 |
Inflows exceeded outflows in 11 of the past 12 months, for a net gain of 2,959.
Population structure
Population by age
As of September 2026Population by age and sex
Unit: people
Male 341,935Female 324,649
Age structure
Unit: %
Youth 11.4%Working age 72.3%Seniors 16.3%
50s is the largest group, at 111,834 people.
Population ranking
Population by region
As of September 2026| Region | Share | ||
|---|---|---|---|
| Seobuk-gu | 402,712 | 60.4% | 40.9 yrs |
| Dongnam-gu | 263,872 | 39.6% | 44.9 yrs |
Seobuk-gu alone holds 60.4% of the population of Cheonan-si, Chungcheongnam-do.
Frequently asked questionsβ
Cheonan-si, Chungcheongnam-do has 666,584 residents as of September 2026., 3,625 more than a year earlier.
Seobuk-gu, home to 402,712 residents (60.4% of Cheonan-si, Chungcheongnam-do).
It is 42.5 as of September 2026., 3.2 years below the national average of 45.7. Among its districts, Seobuk-gu is youngest at 40.9 and Dongnam-gu oldest at 44.9.
It rose 1.4% over 4 years, from 657,612 in 2022 to 666,584 in September 2026.
As of August 2026, the most people moved in from Asan-si (459) and the most moved out to Asan-si (875). Inflows exceeded outflows in 11 of the past 12 months, for a net gain of 2,959.
This is resident registration data from Korea's Ministry of the Interior and Safety. Figures are as of the end of September 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 π
- Resident registration data, Ministry of the Interior and SafetyKOGL Type 1 Β· as of September 2026 Β· updated monthly
- Internal Migration Statistics, Statistics Korea (KOSIS)KOGL Type 1 Β· as of August 2026 Β· updated monthly