1,206-CITY ATLASSOURCE-BACKED CITY REFERENCE
South Korea
Compare this sourced profile of Seongnam-si, South Korea before planning. Stable fields identify the place; confirm current transport, access and opening details with official sources.
01What the data says — and does not say
This page separates the checked GeoNames row for Seongnam-si—914,832, Asia/Seoul, and source coordinates—from live travel claims. Those fields identify and compare the record; they do not prove current transport, accessibility, census totals, or a City Atlas Club visit.
Wikidata's localized description: human settlement in South Korea.
02This city's dataset fingerprint
The source row behind Seongnam-si is GeoNames ID 1897000. Its recorded administrative path is Seongnam-si → Gyeonggi-do → South Korea, and GeoNames classifies the place as a populated place. Seongnam-si occurs once as a primary city label in this atlas sample; the numeric ID remains the durable source key if names change. The city row itself was updated 2025-04-01; that date belongs to the source record, not to every transport or visitor detail in the real destination.
Within the fixed 1,206-record atlas, Seongnam-si ranks 601 by recorded population. Inside the 22 selected South Korea entries it ranks 11; inside the 632 entries in its broad region it ranks 350. Its 914,832 population value is 1.04 times the 883,490 median for the country cohort and 0.91 times the 1,008,426 regional median. Seongnam-si sits in the second quarter of this atlas's South Korea population cohort. Seongnam-si's recorded value stays within one quarter of the country-cohort median used here. These comparisons describe this selected dataset only; they are not current census rankings or official urban-area boundaries.
Seongnam-si's three nearest other atlas coordinates are Anyang-si at 19.314 km with 595,644 recorded people; Seoul at 19.958 km with 10,349,312 recorded people; Suwon at 19.969 km with 1,234,582 recorded people. The closest-to-farthest distance spread is 0.655 km. Compared with Anyang-si, Seongnam-si's recorded population is 1.54 times as large. Against Seongnam-si, Anyang-si follows Anyang-si → Gyeonggi-do → South Korea in the source. Its point has lower latitude and lower longitude; it belongs to the same selected South Korea cohort, uses the shared Asia/Seoul identifier, and carries the same populated place class. Its recorded population is below Seongnam-si's. Against Seongnam-si, Seoul follows Seoul → South Korea in the source. Its point has higher latitude and lower longitude; it belongs to the same selected South Korea cohort, uses the shared Asia/Seoul identifier, and carries capital of a political entity rather than populated place. Its recorded population is above Seongnam-si's. Against Seongnam-si, Suwon follows Suwon-si → Gyeonggi-do → South Korea in the source. Its point has lower latitude and lower longitude; it belongs to the same selected South Korea cohort, uses the shared Asia/Seoul identifier, and carries first-order administrative seat rather than populated place. Its recorded population is above Seongnam-si's. Its nearest-neighbor distance ranks 258 of 1,206 from shortest to longest in the same snapshot. Seongnam-si's nearest-coordinate gap falls between the tightest tenth and quarter of the atlas. This pattern can reveal whether other catalog references are geographically close, but it cannot establish whether a border crossing is possible or practical, or whether rail, road, fare, or journey-time connections exist. Read as one record signature, GeoNames 1897000, the coordinate pair 37.4386 / 127.1378, country rank 11 of 22, and neighbor GeoNames 1846898 at 19.314 km bind Seongnam-si to a reproducible comparison. That combined key distinguishes the row; it is not a recommendation or evidence of a physical connection.
Seongnam-si's reference point is 37.4386° north and 127.1378° east. The IANA identifier Asia/Seoul is shared by 22 city rows in this catalog, while the GeoNames class PPL is shared by 243 rows. Seongnam-si's row carries both second- and first-order administrative labels. Seongnam-si's point falls in the middle-latitude coordinate band used by this atlas's row checks. Seongnam-si's time-zone field defines the narrower catalog cohort; its place class is shared more broadly. GeoNames supplies no elevation for Seongnam-si, so the profile preserves that missing value instead of guessing terrain. Together these fields form a reproducible identity check for this page, not a claim about walkability, climate or accessibility.
03Nearby atlas references
Seongnam-si's closest other entries in this atlas are Anyang-si (19.314 km), Seoul (19.958 km), Suwon (19.969 km).
04Verify before you book
Before visiting Seongnam-si, confirm changing decisions with current first-party sources:
Read how City Atlas Club verifies changing travel facts →05Sources and freshness
GeoNames updated the row 2025-04-01; the atlas checked the dataset 2026-08-04. Available Wikidata fields were verified in the same run.
GeoNames data: CC BY 4.0. Wikidata labels and descriptions: CC0 1.0.