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Seoul Botanic Park Greenhouse & Bear Sculpture, Magok-dong, Gangseo-guNational Aviation Museum, Gonghang-dong, Gangseo-guGangseo Wetland Eco Park Boardwalk, Banghwa-dong, Gangseo-guYangcheon Hyanggyo Hongsalmun Gate & Steps, Gayang-dong, Gangseo-guGaehwasan Hoguk Park Lawn, Gaehwa-dong, Gangseo-guYeomchang-dong Riverside Apartments, Yeomchang-dong, Gangseo-guUjangsan Park Lawn Square, Naebalsan-dong, Gangseo-guDeungchon-dong Apartment Complex Street, Deungchon-dong, Gangseo-gu

Population of Gangseo-gu, Seoul

As of September 2026

Total population547,821people
Households274,703households
Average age45.1yrs
Sex ratioMale261,347peopleFemale286,474people47.7%52.3%

Population change

Change over time

4-year trend

Unit: people

572,230 in 2022565,195 in 2023557,998 in 2024551,234 in 2025547,821 in 202620222023202420252026

572,230 in 2022547,821 in 2026

Down 4.3% over the past 4 years.

Migration

As of August 2026

Monthly Overview

Moved in5,722people
Moved out6,182people
Net migrationβˆ’460people

Net migration by month

Unit: people

βˆ’527βˆ’403βˆ’235βˆ’210βˆ’161βˆ’504βˆ’85βˆ’331βˆ’122βˆ’160βˆ’289βˆ’460SepOctNovDecJanFebMarAprMayJunJulAugβˆ’527 in Sep 2025βˆ’403 in Oct 2025βˆ’235 in Nov 2025βˆ’210 in Dec 2025βˆ’161 in Jan 2026βˆ’504 in Feb 2026βˆ’85 in Mar 2026βˆ’331 in Apr 2026βˆ’122 in May 2026βˆ’160 in Jun 2026βˆ’289 in Jul 2026βˆ’460 in Aug 2026

Net inflowNet outflow

Top origins

Unit: people

RegionMoved in
Yangcheon-gu576
Yeongdeungpo-gu229
Mapo-gu135
Guro-gu131
Gwanak-gu131

Top destinations

Unit: people

RegionMoved out
Yangcheon-gu430
Gimpo-si, Gyeonggi290
Goyang-si, Gyeonggi244
Yeongdeungpo-gu177
Bucheon-si, Gyeonggi156

Outflows exceeded inflows in every one of the past 12 months, for a net loss of 3,487.

Want more detail on migration in Gangseo-gu?See more Gangseo-gu statistics on GData

Population structure

Population by age

As of September 2026

Population by age and sex

Unit: people

Under 1010s20sπŸ‘‘ 30s40s50s60s70s80s90s100+13,24420,20730,71148,09540,68039,61436,13623,4698,2569211412,63719,43038,33648,74440,37341,25442,40028,55312,1632,49784

Male 261,347Female 286,474

Age structure

Unit: %

Youth 8.3%Working age 70.6%Seniors 21.0%70.6%21.0%

Youth 8.3%Working age 70.6%Seniors 21.0%

30s is the largest group, at 96,839 people.

Population ranking

Population by region

As of September 2026
  • YoungestMagok-dong39.8 yrs
  • OldestOgok-dong62 yrs
RegionShare
Hwagok-dong210,42638.4%45.8 yrs
Deungchon-dong72,57813.2%45.8 yrs
Magok-dong61,31311.2%39.8 yrs
Banghwa-dong58,33010.6%48.5 yrs
Naebalsan-dong44,1998.1%43.1 yrs
Yeomchang-dong40,8997.5%40.8 yrs
Gayang-dong40,7927.4%49.4 yrs
Gonghang-dong16,7843.1%46.7 yrs
Gaehwa-dong1,5100.3%54.3 yrs
Oebalsan-dong9620.2%47.2 yrs

The top three areas hold 62.9% of the population of Gangseo-gu, Seoul.

Want to explore Gangseo-gu's demographics in more detail?See more Gangseo-gu statistics on GData

Frequently asked questions❓

Gangseo-gu, Seoul has 547,821 residents as of September 2026., 3,413 fewer than a year earlier.
Hwagok-dong, home to 210,426 residents (38.4% of Gangseo-gu, Seoul).
It is 45.1 as of September 2026., 0.6 years below the national average of 45.7. Among its neighborhoods, Magok-dong is youngest at 39.8 and Ogok-dong oldest at 62.
It fell 4.3% over 4 years, from 572,230 in 2022 to 547,821 in September 2026.
As of August 2026, the most people moved in from Yangcheon-gu (576) and the most moved out to Yangcheon-gu (430). Outflows exceeded inflows in every one of the past 12 months, for a net loss of 3,487.
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 🌐