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Gyeongbokgung Geunjeongjeon Hall, Hyoja-dong, Jongno-guNamsan Seoul Tower, Yongsandong2-ga, Yongsan-guLotte World Tower & Seokchon Lake, Sincheon-dong, Songpa-guGwanghwamun Square & Gwanghwamun Gate, Sajik-dong, Jongno-guCOEX & World Trade Center, Samseong-dong, Gangnam-gu63 Building Across Mapo Bridge, Yeouido-dong, Yeongdeungpo-guSungnyemun Gate, Namdaemullo4-ga, Jung-guHongdae Walking Street Intersection, Seogyo-dong, Mapo-gu

Population of Seoul

As of September 2026

Total population9,281,625people
Households4,525,061households
Average age45.1yrs
Sex ratioMale4,466,290peopleFemale4,815,335people48.1%51.9%

Population change

Change over time

4-year trend

Unit: people

9,488,455 in 20229,409,488 in 20239,355,801 in 20249,321,863 in 20259,281,625 in 202620222023202420252026

9,488,455 in 20229,281,625 in 2026

Down 2.2% over the past 4 years.

Migration

As of August 2026

Monthly Overview

Moved in103,315people
Moved out106,216people
Net migrationβˆ’2,901people

Net migration by month

Unit: people

βˆ’3,382βˆ’4,705βˆ’5,504βˆ’4,887βˆ’1054,227βˆ’167βˆ’6,341βˆ’4,221βˆ’5,697βˆ’6,108βˆ’2,901SepOctNovDecJanFebMarAprMayJunJulAugβˆ’3,382 in Sep 2025βˆ’4,705 in Oct 2025βˆ’5,504 in Nov 2025βˆ’4,887 in Dec 2025βˆ’105 in Jan 20264,227 in Feb 2026βˆ’167 in Mar 2026βˆ’6,341 in Apr 2026βˆ’4,221 in May 2026βˆ’5,697 in Jun 2026βˆ’6,108 in Jul 2026βˆ’2,901 in Aug 2026

Net inflowNet outflow

Top origins

Unit: people

RegionMoved in
Gyeonggi19,147
Incheon2,803
Busan1,483
Chungcheongnam-do1,425
Gangwon1,351

Top destinations

Unit: people

RegionMoved out
Gyeonggi23,755
Incheon3,804
Chungcheongnam-do1,328
Gangwon1,205
Busan1,036

Outflows exceeded inflows in 11 of the past 12 months, for a net loss of 39,791.

Want more detail on migration in Seoul?See more Seoul statistics on GData

Population structure

Population by age

As of September 2026

Population by age and sex

Unit: people

Under 1010s20sπŸ‘‘ 30s40s50s60s70s80s90s100+231,371363,798570,462734,129668,162716,410624,884384,466155,18117,104319219,355350,183654,355736,447685,003742,494689,805470,525224,13641,8521,155

Male 4,466,290Female 4,815,335

Age structure

Unit: %

Youth 8.7%Working age 70.3%Seniors 21.0%70.3%21.0%

Youth 8.7%Working age 70.3%Seniors 21.0%

30s is the largest group, at 1,470,576 people.

Population ranking

Population by region

As of September 2026
RegionShare
Songpa-gu649,2127%43.8 yrs
Gangnam-gu552,3576%43.1 yrs
Gangseo-gu547,8215.9%45.1 yrs
Gangdong-gu498,2225.4%44.3 yrs
Nowon-gu480,0455.2%45.9 yrs
Gwanak-gu477,2975.1%44.1 yrs
Eunpyeong-gu452,6264.9%46.7 yrs
Seongbuk-gu421,1064.5%45.1 yrs
Yangcheon-gu420,1274.5%44.9 yrs
Seocho-gu416,9284.5%43.1 yrs

The top three areas hold 18.8% of the population of Seoul.

Frequently asked questions❓

Seoul has 9,281,625 residents as of September 2026., 40,238 fewer than a year earlier.
Songpa-gu, home to 649,212 residents (7.0% of Seoul).
It is 45.1 as of September 2026., 0.6 years below the national average of 45.7. Among its districts, Gangnam-gu is youngest at 43.1 and Gangbuk-gu oldest at 49.1.
It fell 2.2% over 4 years, from 9,488,455 in 2022 to 9,281,625 in September 2026.
As of August 2026, the most people moved in from Gyeonggi (19,147) and the most moved out to Gyeonggi (23,755). Outflows exceeded inflows in 11 of the past 12 months, for a net loss of 39,791.
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 🌐