Total population274,199people
Households133,694households
Average age44.7yrs
Sex ratioMale132,196peopleFemale142,003people48.2%51.8%
Population change
Change over time
4-year trendUnit: people
283,603 in 2022274,199 in 2026
Down 3.3% over the past 4 years.
Migration
As of August 2026Monthly Overview
Moved in2,886people
Moved out3,124people
Net migrationβ238people
Net migration by month
Unit: people
Net inflowNet outflow
Top origins
Unit: people
| Region | Moved in |
|---|---|
| Gangnam-gu | 167 |
| Dongdaemun-gu | 112 |
| Jung-gu | 109 |
| Gwangjin-gu | 109 |
| Songpa-gu | 101 |
Top destinations
Unit: people
| Region | Moved out |
|---|---|
| Gangnam-gu | 216 |
| Dongdaemun-gu | 209 |
| Gwangjin-gu | 156 |
| Seocho-gu | 145 |
| Songpa-gu | 120 |
Net migration varied across the past 12 months, totaling +36.
Population structure
Population by age
As of September 2026Population by age and sex
Unit: people
Male 132,196Female 142,003
Age structure
Unit: %
Youth 8.8%Working age 71.2%Seniors 20.0%
30s is the largest group, at 48,267 people.
Population ranking
Population by region
As of September 2026- YoungestSageun-dong40.6 yrs
- OldestHongik-dong50.4 yrs
| Region | Share | ||
|---|---|---|---|
| Haengdang-dong | 43,402 | 15.8% | 43.2 yrs |
| Hawangsimni-dong | 29,507 | 10.8% | 43.9 yrs |
| Seongsudong1-ga | 28,997 | 10.6% | 44.7 yrs |
| Oksu-dong | 25,115 | 9.2% | 44.1 yrs |
| Seongsudong2-ga | 22,525 | 8.2% | 47.7 yrs |
| Majang-dong | 21,406 | 7.8% | 45 yrs |
| Eungbong-dong | 14,349 | 5.2% | 44.4 yrs |
| Geumhodong1-ga | 14,233 | 5.2% | 45.7 yrs |
| Geumhodong4-ga | 13,682 | 5% | 45.3 yrs |
| Yongdap-dong | 13,081 | 4.8% | 44.2 yrs |
| Geumhodong3-ga | 11,488 | 4.2% | 47.3 yrs |
| Songjeong-dong | 9,110 | 3.3% | 47.3 yrs |
| Geumhodong2-ga | 9,064 | 3.3% | 43.3 yrs |
| Sageun-dong | 6,608 | 2.4% | 40.6 yrs |
| Doseon-dong | 4,584 | 1.7% | 42.5 yrs |
| Sangwangsimni-dong | 3,630 | 1.3% | 40.7 yrs |
| Hongik-dong | 3,418 | 1.2% | 50.4 yrs |
The top three areas hold 37.2% of the population of Seongdong-gu, Seoul.
Want to explore Seongdong-gu's demographics in more detail?See more Seongdong-gu statistics on GData
Frequently asked questionsβ
Seongdong-gu, Seoul has 274,199 residents as of September 2026., 678 more than a year earlier.
Haengdang-dong, home to 43,402 residents (15.8% of Seongdong-gu, Seoul).
It is 44.7 as of September 2026., 1 years below the national average of 45.7. Among its neighborhoods, Sageun-dong is youngest at 40.6 and Hongik-dong oldest at 50.4.
It fell 3.3% over 4 years, from 283,603 in 2022 to 274,199 in September 2026.
As of August 2026, the most people moved in from Gangnam-gu (167) and the most moved out to Gangnam-gu (216). Net migration varied across the past 12 months, totaling +36.
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