Total population899,806people
Households408,379households
Average age44.5yrs
Sex ratioMale444,192peopleFemale455,614people49.4%50.6%
Population change
Change over time
4-year trendUnit: people
924,333 in 2022899,806 in 2026
Down 2.7% over the past 4 years.
Migration
As of August 2026Monthly Overview
Moved in8,454people
Moved out9,825people
Net migrationβ1,371people
Net migration by month
Unit: people
Net inflowNet outflow
Top origins
Unit: people
| Region | Moved in |
|---|---|
| Yongin-si | 568 |
| Gwangju-si | 320 |
| Songpa-gu, Seoul | 304 |
| Gangnam-gu, Seoul | 273 |
| Suwon-si | 241 |
Top destinations
Unit: people
| Region | Moved out |
|---|---|
| Gwangju-si | 870 |
| Yongin-si | 695 |
| Suwon-si | 320 |
| Songpa-gu, Seoul | 312 |
| Gangnam-gu, Seoul | 266 |
Outflows exceeded inflows in 11 of the past 12 months, for a net loss of 8,398.
Population structure
Population by age
As of September 2026Population by age and sex
Unit: people
Male 444,192Female 455,614
Age structure
Unit: %
Youth 10.4%Working age 69.9%Seniors 19.7%
50s is the largest group, at 149,193 people.
Population ranking
Population by region
As of September 2026| Region | Share | ||
|---|---|---|---|
| Bundang-gu | 466,625 | 51.9% | 43 yrs |
| Sujeong-gu | 234,948 | 26.1% | 45.7 yrs |
| Jungwon-gu | 198,233 | 22% | 46.5 yrs |
Bundang-gu alone holds 51.9% of the population of Seongnam-si, Gyeonggi.
Frequently asked questionsβ
Seongnam-si, Gyeonggi has 899,806 residents as of September 2026., 7,720 fewer than a year earlier.
Bundang-gu, home to 466,625 residents (51.9% of Seongnam-si, Gyeonggi).
It is 44.5 as of September 2026., 1.2 years below the national average of 45.7. Among its districts, Bundang-gu is youngest at 43 and Jungwon-gu oldest at 46.5.
It fell 2.7% over 4 years, from 924,333 in 2022 to 899,806 in September 2026.
As of August 2026, the most people moved in from Yongin-si (568) and the most moved out to Gwangju-si (870). Outflows exceeded inflows in 11 of the past 12 months, for a net loss of 8,398.
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