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Multicultural Food Street by Ansan Station, Wongok-dong, Danwon-guUniversity District by Handae-ap Sta. (Hanyang ERICA), Sa-dong, Sangnok-gu

Population of Ansan-si, Gyeonggi

As of September 2026

Total population608,487people
Households289,482households
Average age45yrs
Sex ratioMale311,577peopleFemale296,910people51.2%48.8%

Population change

Change over time

4-year trend

Unit: people

647,266 in 2022634,284 in 2023624,005 in 2024614,232 in 2025608,487 in 202620222023202420252026

647,266 in 2022608,487 in 2026

Down 6% over the past 4 years.

Migration

As of August 2026

Monthly Overview

Moved in4,739people
Moved out5,154people
Net migrationβˆ’415people

Net migration by month

Unit: people

βˆ’367βˆ’361βˆ’373βˆ’484βˆ’666βˆ’380βˆ’634βˆ’717βˆ’389βˆ’480βˆ’338βˆ’415SepOctNovDecJanFebMarAprMayJunJulAugβˆ’367 in Sep 2025βˆ’361 in Oct 2025βˆ’373 in Nov 2025βˆ’484 in Dec 2025βˆ’666 in Jan 2026βˆ’380 in Feb 2026βˆ’634 in Mar 2026βˆ’717 in Apr 2026βˆ’389 in May 2026βˆ’480 in Jun 2026βˆ’338 in Jul 2026βˆ’415 in Aug 2026

Net inflowNet outflow

Top origins

Unit: people

RegionMoved in
Siheung-si271
Hwaseong-si210
Suwon-si162
Anyang-si115
Gunpo-si91

Top destinations

Unit: people

RegionMoved out
Siheung-si347
Hwaseong-si318
Suwon-si198
Pyeongtaek-si115
Anyang-si88

Outflows exceeded inflows in every one of the past 12 months, for a net loss of 5,604.

Want more detail on migration in Ansan-si?See more Ansan-si statistics on GData

Population structure

Population by age

As of September 2026

Population by age and sex

Unit: people

Under 1010s20s30s40sπŸ‘‘ 50s60s70s80s90s100+14,39826,38941,82346,12743,72059,12053,34419,4796,3457993113,84725,19636,97636,96239,50359,27949,48921,40811,4042,741103

Male 311,577Female 296,910

Age structure

Unit: %

Youth 8.9%Working age 72.4%Seniors 18.7%8.9%72.4%18.7%

Youth 8.9%Working age 72.4%Seniors 18.7%

50s is the largest group, at 118,399 people.

Population ranking

Population by region

As of September 2026
RegionShare
Sangnok-gu320,36052.6%45.4 yrs
Danwon-gu288,12747.4%44.5 yrs

Sangnok-gu alone holds 52.6% of the population of Ansan-si, Gyeonggi.

Frequently asked questions❓

Ansan-si, Gyeonggi has 608,487 residents as of September 2026., 5,745 fewer than a year earlier.
Sangnok-gu, home to 320,360 residents (52.6% of Ansan-si, Gyeonggi).
It is 45 as of September 2026., 0.7 years below the national average of 45.7. Among its districts, Danwon-gu is youngest at 44.5 and Sangnok-gu oldest at 45.4.
It fell 6% over 4 years, from 647,266 in 2022 to 608,487 in September 2026.
As of August 2026, the most people moved in from Siheung-si (271) and the most moved out to Siheung-si (347). Outflows exceeded inflows in every one of the past 12 months, for a net loss of 5,604.
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 🌐