Quick facts
Seongnam-si overview
Seongnam-si (orange) and the other large cities of South Korea
Seongnam-si lies in Gyeonggi-do in South Korea at 37.44°N, 127.14°E, about 80 m above sea level. The local time zone is Asia/Seoul (UTC+9).
It is smaller than Changwon (1,025,702) and larger than Cheongju-si (852,147). The largest city in South Korea is Seoul with 10,349,312 people; the capital, Seoul, has 10,349,312.
The national capital, Seoul, is about 20 km away; the nearest large city is Hanam, 13 km from Seongnam-si.
South Korea as a whole has a live population of 51,579,911 (-0.1% a year) and ranks #31 of 238 countries — see the South Korea population page for the full statistics and the South Korea atlas for provinces, terrain and society maps.
Cities near Seongnam-si
| City | Distance | Population |
|---|---|---|
| Hanam Gyeonggi-do | 13 km | 254,415 |
| Guri-si Gyeonggi-do | 18 km | 195,236 |
| Gunpo Gyeonggi-do | 19 km | 286,485 |
| Anyang-si Gyeonggi-do | 19 km | 595,644 |
| SeoulCapital Seoul | 20 km | 10,349,312 |
| Suwon Gyeonggi-do | 20 km | 1,234,582 |
| Gwangmyeong Gyeonggi-do | 24 km | 357,545 |
| Hwado Gyeonggi-do | 28 km | 106,358 |
Largest cities in South Korea
Frequently asked questions
What is the population of Seongnam-si?
Seongnam-si has about 914,832 inhabitants according to the latest official census or estimate compiled by GeoNames. This is the city proper; the metropolitan area is larger.
Is Seongnam-si the capital of South Korea?
No. The capital of South Korea is Seoul (10,349,312 people), about 20 km away. Seongnam-si is the 11th largest city of the country.
How big is Seongnam-si compared with the rest of South Korea?
Its 914,832 residents are 1.8% of the 51,579,911 people living in South Korea today. Seoul is larger with 10,349,312 people.
Where is Seongnam-si?
In Gyeonggi-do, South Korea, at latitude 37.44 and longitude 127.14, 80 m above sea level. Nearby large cities include Hanam (13 km), Guri-si (18 km), Gunpo (19 km).
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Cite or link to this page
Glostats. (2026). Seongnam-si Population 2026 — South Korea. Retrieved October 20, 2026, from https://glostats.com/cities/south-korea/seongnam-si/<a href="https://glostats.com/cities/south-korea/seongnam-si/">Seongnam-si Population 2026 — South Korea</a> — GlostatsFigures on this page may be quoted, charted or republished as long as the page is credited with a link. Terms · Download the data as CSV · Embed a live counter.
City populations are GeoNames figures (CC BY 4.0): the latest official census or estimate for the city proper — the municipality, not the wider metropolitan area — so they can differ from "metro area" numbers you see elsewhere. Country populations are live Glostats estimates from the UN World Population Prospects. Distances are great-circle distances between city centres. Page generated 2026-10-20. More about our data.