Total population668,150people
Households289,535households
Average age41.8yrs
Sex ratioMale335,486peopleFemale332,664people50.2%49.8%
Population change
Change over time
4-year trendUnit: people
578,529 in 2022668,150 in 2026
Up 15.5% over the past 4 years.
Migration
As of August 2026Monthly Overview
Moved in0people
Moved out0people
Net migration0people
Net migration by month
Unit: people
Net inflowNet outflow
Inflows exceeded outflows in 10 of the past 12 months, for a net gain of 14,505.
Population structure
Population by age
As of September 2026Population by age and sex
Unit: people
Male 335,486Female 332,664
Age structure
Unit: %
Youth 13.2%Working age 71.4%Seniors 15.4%
40s is the largest group, at 115,582 people.
Population ranking
Population by region
As of September 2026- YoungestWondang-dong36.5 yrs
- OldestDaegok-dong58.9 yrs
| Region | Share | ||
|---|---|---|---|
| Cheongna-dong | 115,375 | 17.3% | 37.9 yrs |
| Dangha-dong | 81,062 | 12.1% | 39.1 yrs |
| Gajeong-dong | 68,124 | 10.2% | 40.8 yrs |
| Gajwa-dong | 56,836 | 8.5% | 48 yrs |
| Wondang-dong | 53,469 | 8% | 36.5 yrs |
| Majeon-dong | 49,839 | 7.5% | 43.5 yrs |
| Bullo-dong | 47,889 | 7.2% | 38.2 yrs |
| Seongnam-dong | 43,892 | 6.6% | 49.3 yrs |
| Geomam-dong | 28,977 | 4.3% | 42.7 yrs |
| Sinhyeon-dong | 28,130 | 4.2% | 45.4 yrs |
| Wanggil-dong | 19,824 | 3% | 44.4 yrs |
| Simgok-dong | 19,500 | 2.9% | 48.5 yrs |
| Gyeongseo-dong | 14,452 | 2.2% | 41.6 yrs |
| Baekseok-dong | 12,784 | 1.9% | 36.9 yrs |
| Yeonhui-dong | 12,205 | 1.8% | 48.1 yrs |
| Oryu-dong | 5,743 | 0.9% | 45 yrs |
| Geumgok-dong | 4,305 | 0.6% | 45 yrs |
| Gongchon-dong | 4,248 | 0.6% | 48.3 yrs |
| Daegok-dong | 1,104 | 0.2% | 58.9 yrs |
| Wonchang-dong | 333 | 0% | 48.3 yrs |
| Sicheon-dong | 59 | 0% | 57.4 yrs |
The top three areas hold 39.6% of the population of Seo-gu, Incheon.
Frequently asked questionsβ
Seo-gu, Incheon has 668,150 residents as of September 2026., 21,447 more than a year earlier.
Cheongna-dong, home to 115,375 residents (17.3% of Seo-gu, Incheon).
It is 41.8 as of September 2026., 3.9 years below the national average of 45.7. Among its neighborhoods, Wondang-dong is youngest at 36.5 and Daegok-dong oldest at 58.9.
It rose 15.5% over 4 years, from 578,529 in 2022 to 668,150 in September 2026.
Inflows exceeded outflows in 10 of the past 12 months, for a net gain of 14,505.
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