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Sadang Station Intersection Bus Stop, Sadang-dong, Dongjak-guHangang Bridge from Nodeul Naru Park, Bon-dong, Dongjak-guHyosajeong Pavilion & Han River, Heukseok-dong, Dongjak-guSeoul National Cemetery Memorial Fountain, Dongjak-dong, Dongjak-guSayuksin Park, Noryangjin-dong, Dongjak-guBoramae Park Playground, Sindaebang-dong, Dongjak-guHillside Road near Soongsil University, Sangdo1-dong, Dongjak-guSeoul Women's Plaza, Daebang-dong, Dongjak-gu

Population of Dongjak-gu, Seoul

As of September 2026

Total population371,324people
Households187,770households
Average age44.8yrs
Sex ratioMale179,201peopleFemale192,123people48.3%51.7%

Population change

Change over time

4-year trend

Unit: people

385,379 in 2022380,478 in 2023377,426 in 2024373,899 in 2025371,324 in 202620222023202420252026

385,379 in 2022371,324 in 2026

Down 3.6% over the past 4 years.

Migration

As of August 2026

Monthly Overview

Moved in4,506people
Moved out4,775people
Net migrationβˆ’269people

Net migration by month

Unit: people

βˆ’520βˆ’296βˆ’422βˆ’661βˆ’202βˆ’45447βˆ’214βˆ’377βˆ’523βˆ’269SepOctNovDecJanFebMarAprMayJunJulAugβˆ’520 in Sep 2025βˆ’296 in Oct 2025βˆ’422 in Nov 2025βˆ’661 in Dec 2025βˆ’202 in Jan 2026βˆ’45 in Feb 2026447 in Mar 2026βˆ’21 in Apr 20264 in May 2026βˆ’377 in Jun 2026βˆ’523 in Jul 2026βˆ’269 in Aug 2026

Net inflowNet outflow

Top origins

Unit: people

RegionMoved in
Gwanak-gu336
Seocho-gu300
Yeongdeungpo-gu231
Gangnam-gu122
Songpa-gu116

Top destinations

Unit: people

RegionMoved out
Gwanak-gu449
Seocho-gu446
Yeongdeungpo-gu227
Gangseo-gu123
Guro-gu115

Outflows exceeded inflows in 10 of the past 12 months, for a net loss of 2,885.

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

Population structure

Population by age

As of September 2026

Population by age and sex

Unit: people

Under 1010s20sπŸ‘‘ 30s40s50s60s70s80s90s100+8,84712,70827,81331,89925,31827,31623,19914,6266,718747108,30812,06730,82730,48624,99328,86726,44418,9909,3901,70940

Male 179,201Female 192,123

Age structure

Unit: %

Youth 8.0%Working age 71.3%Seniors 20.8%71.3%20.8%

Youth 8.0%Working age 71.3%Seniors 20.8%

30s is the largest group, at 62,385 people.

Population ranking

Population by region

As of September 2026
  • YoungestSangdo1-dong39.1 yrs
  • OldestBon-dong46.5 yrs
RegionShare
Sangdo-dong112,74330.4%45.2 yrs
Sadang-dong94,56125.5%45.7 yrs
Sindaebang-dong44,83112.1%44 yrs
Daebang-dong33,4059%43.7 yrs
Noryangjin-dong30,4928.2%44.2 yrs
Heukseok-dong29,7998%44.1 yrs
Bon-dong10,3082.8%46.5 yrs
Sangdo1-dong9,7762.6%39.1 yrs
Dongjak-dong5,4091.5%45.8 yrs

The top three areas hold 67.9% of the population of Dongjak-gu, Seoul.

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

Frequently asked questions❓

Dongjak-gu, Seoul has 371,324 residents as of September 2026., 2,575 fewer than a year earlier.
Sangdo-dong, home to 112,743 residents (30.4% of Dongjak-gu, Seoul).
It is 44.8 as of September 2026., 0.9 years below the national average of 45.7. Among its neighborhoods, Sangdo1-dong is youngest at 39.1 and Bon-dong oldest at 46.5.
It fell 3.6% over 4 years, from 385,379 in 2022 to 371,324 in September 2026.
As of August 2026, the most people moved in from Gwanak-gu (336) and the most moved out to Gwanak-gu (449). Outflows exceeded inflows in 10 of the past 12 months, for a net loss of 2,885.
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 🌐