Total population356,008people
Households180,559households
Average age43.6yrs
Sex ratioMale165,141peopleFemale190,867people46.4%53.6%
Population change
Change over time
4-year trendUnit: people
367,190 in 2022356,008 in 2026
Down 3% over the past 4 years.
Migration
As of August 2026Monthly Overview
Moved in4,040people
Moved out4,251people
Net migrationβ211people
Net migration by month
Unit: people
Net inflowNet outflow
Top origins
Unit: people
| Region | Moved in |
|---|---|
| Seodaemun-gu | 233 |
| Yongsan-gu | 161 |
| Eunpyeong-gu | 159 |
| Goyang-si, Gyeonggi | 146 |
| Yeongdeungpo-gu | 118 |
Top destinations
Unit: people
| Region | Moved out |
|---|---|
| Seodaemun-gu | 292 |
| Eunpyeong-gu | 204 |
| Seocho-gu | 187 |
| Goyang-si, Gyeonggi | 185 |
| Yongsan-gu | 150 |
Outflows exceeded inflows in every one of the past 12 months, for a net loss of 3,480.
Population structure
Population by age
As of September 2026Population by age and sex
Unit: people
Male 165,141Female 190,867
Age structure
Unit: %
Youth 8.6%Working age 73.5%Seniors 17.9%
30s is the largest group, at 64,431 people.
Population ranking
Population by region
As of September 2026- YoungestNogosan-dong40.7 yrs
- OldestGusu-dong46 yrs
| Region | Share | ||
|---|---|---|---|
| Seongsan-dong | 46,702 | 13.1% | 44.5 yrs |
| Mangwon-dong | 35,387 | 9.9% | 45.7 yrs |
| Sangam-dong | 28,988 | 8.1% | 43 yrs |
| Ahyeon-dong | 27,959 | 7.9% | 43.2 yrs |
| Gongdeok-dong | 24,973 | 7% | 43.6 yrs |
| Dohwa-dong | 21,137 | 5.9% | 44.7 yrs |
| Seogyo-dong | 18,882 | 5.3% | 42.8 yrs |
| Yeomni-dong | 17,836 | 5% | 41 yrs |
| Daeheung-dong | 16,034 | 4.5% | 43 yrs |
| Hapjeong-dong | 15,454 | 4.3% | 44.6 yrs |
| Sinsu-dong | 15,412 | 4.3% | 43.1 yrs |
| Changjeon-dong | 14,640 | 4.1% | 42.2 yrs |
| Yeonnam-dong | 13,796 | 3.9% | 44.3 yrs |
| Singongdeok-dong | 12,208 | 3.4% | 43.5 yrs |
| Jung-dong | 9,344 | 2.6% | 43.9 yrs |
| Yonggang-dong | 7,579 | 2.1% | 41.7 yrs |
| Sangsu-dong | 7,242 | 2% | 41.8 yrs |
| Nogosan-dong | 5,670 | 1.6% | 40.7 yrs |
| Hyeonseok-dong | 5,061 | 1.4% | 42.9 yrs |
| Donggyo-dong | 3,205 | 0.9% | 44 yrs |
| Mapo-dong | 2,669 | 0.7% | 43.9 yrs |
| Sinjeong-dong | 1,510 | 0.4% | 43.8 yrs |
| Hajung-dong | 1,404 | 0.4% | 46 yrs |
| Tojeong-dong | 1,204 | 0.3% | 41 yrs |
| Dangin-dong | 983 | 0.3% | 44.5 yrs |
| Gusu-dong | 729 | 0.2% | 46 yrs |
The top three areas hold 31.2% of the population of Mapo-gu, Seoul.
Frequently asked questionsβ
Mapo-gu, Seoul has 356,008 residents as of September 2026., 3,001 fewer than a year earlier.
Seongsan-dong, home to 46,702 residents (13.1% of Mapo-gu, Seoul).
It is 43.6 as of September 2026., 2.1 years below the national average of 45.7. Among its neighborhoods, Nogosan-dong is youngest at 40.7 and Gusu-dong oldest at 46.
It fell 3% over 4 years, from 367,190 in 2022 to 356,008 in September 2026.
As of August 2026, the most people moved in from Seodaemun-gu (233) and the most moved out to Seodaemun-gu (292). Outflows exceeded inflows in every one of the past 12 months, for a net loss of 3,480.
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