South Korea Postal Code Finder
Enter any South Korea postal code and this tool returns the place name, state and coordinates instantly, with a marker on the map. The lookup runs live against the open Zippopotam database — type a code such as 04524 to see the result for yourself.
Zippopotam is community-maintained, so coverage varies by country and a valid code can occasionally return no match. When that happens, double-check the format (5 digits) and confirm with South Korea's national postal service. Lookups are free, need no sign-up or API key, and nothing you enter is stored.
How to use this tool
The dropdown above the input is pre-set to South Korea on this page — you can switch it to any of the other 39 countries to compare postal systems.
Type the code in South Korea's format (5 digits) — for example 04524 — and press Lookup or Enter.
The tool shows the place name, state, latitude/longitude and a map marker for every locality attached to the code. If nothing is found, the message says so honestly — check the digits or confirm the code with the national postal service.
What people use this tool for
Look up the code — for example 04524 — before addressing letters or parcels to South Korea, so the item reaches the right sorting office. A single wrong digit can send a parcel to the wrong city.
Online shops and official forms in South Korea require the postcode field. Double-check an unfamiliar code (5 digits) here before you pay or submit, and catch typos before they cause a failed delivery.
Every result includes latitude and longitude — drop a pin for a district around Seoul, plan a route, or geo-tag records without needing a full street address.
How it's calculated
Postal code lookup queries the public Zippopotam API directly from your browser: GET https://api.zippopotam.us/kr/{postal-code}. A successful response returns the country, the canonical post code and a list of places, each with place name, state, state abbreviation, latitude and longitude. The widget renders every returned place — name, state, decimal-degree coordinates — and drops a marker for each on the map (OpenStreetMap tiles via Leaflet).
If the API returns 404, the tool reports "not found" honestly: the code may be mistyped, or it may simply be absent from this open database. Coverage varies by country, so a missing code is never treated as proof the code is invalid — the message points you to South Korea's national postal service for confirmation.
No API key or account is needed, and nothing you type is stored on our servers — the postal code travels from your browser to Zippopotam and back. Keep lookups at a reasonable pace so the free public API stays available for everyone.
Related tools and resources
Frequently asked questions
How do I look up a South Korea postal code with this tool?
Make sure the country dropdown is set to South Korea — it already is on this page. Type the code in South Korea's format (5 digits), for example 04524, and press Lookup. The tool queries the open Zippopotam database live and returns the place name, state and coordinates with a map marker. Lookups are free, need no sign-up or API key, and nothing you enter is stored.
What does a South Korea postal code look like?
In South Korea, postal codes follow this format: 5 digits. A typical example is 04524. Enter the code exactly as it is normally written — including any spaces or dashes — because missing digits or wrong spacing usually produce a "not found" result.
Why did my South Korea postal code return “not found”?
Two possibilities: a typo — often a spacing or dash issue, since South Korea codes are written as 5 digits — or the code is simply absent from the open Zippopotam database. Coverage varies by country, and this community-maintained database has gaps. Try 04524 to confirm the tool is working, then double-check your digits and confirm the code with South Korea's national postal service.
Is this South Korea postal code lookup official and free?
It is free and unlimited, with no account required — but it is not official. This is an independent lookup for South Korea's 5 digits codes (for example 04524), built on the open Zippopotam database. For anything mail-critical, verify the code with South Korea's national postal service. Your browser queries the public API directly, and we do not log the codes you look up.
Data sources & methodology
- Zippopotam — Open postal-code database queried live for every lookup; no API key required.
- OpenStreetMap — Base map tiles for the result marker map.