Korea switched from 6-digit to 5-digit postal codes in 2015. When entering a ZIP Code on overseas shopping sites, always use the 5-digit number. This guide explains how to find and use a Korean postal code.
The 5-digit format
Since August 2015, Korea uses a unified 5-digit postal code. Enter the 5 digits as-is in the ZIP/Postal Code field. The old 6-digit codes no longer work.
How to find a Korean postal code
Search any address with the Korean address converter and the postal code appears automatically in the result. Copy it from the ZIP Code field.
Entering it on shopping sites
- ZIP / Postal Code → enter the 5 digits (e.g., 06234)
- If a ZIP+4 format is required → 06234-0000
- If only a 6-digit field exists → enter the 5 digits anyway
Example postal codes by region
- Gangnam-gu, Seoul: 06### range
- Mapo-gu, Seoul: 04### range
- Suwon-si, Gyeonggi-do: 16### range
- Busan: 46###–49### range
FAQ
Do old 6-digit codes still work?
No, they were retired in 2015. Use the converter to find the current 5-digit code.
What if I don't know the postal code?
Just search the address — the converter retrieves the postal code automatically from official data.
The converter uses the official API from Korea's Ministry of the Interior and Safety, so postal codes and English address formatting are always accurate.
Looking up a postal code correctly
The only authoritative source is the government road-name address system (juso.go.kr) and services built on its API. Type any part of the Korean address — building name, road name, or the old dong/jibun form — and the official 5-digit code is returned together with the standardized English address. Avoid copying codes from old blog posts or cached pages: boundary adjustments happen every year and stale codes are a common cause of customs and delivery delays.
Old 6-digit codes you may still encounter
Documents, membership forms, and websites created before August 2015 may still show 6-digit codes (e.g. 135-080). These are no longer valid. If a foreign form was filled years ago with a 6-digit code, look up the current 5-digit code before reusing the address — carriers no longer map the old system automatically.
Frequently asked questions
Is the Korean postal code the same as a ZIP code? Functionally yes. In US-style forms, enter the 5-digit Korean code into the ZIP field as-is. There is no letter component like UK or Canadian postcodes.
What if a form requires 6 digits or rejects 5? Some outdated foreign forms hard-code a 6-digit rule. Adding a leading zero is a common workaround (e.g. 06236 → 006236 is wrong, though — instead contact the shop). Never invent digits; if the form cannot be fixed, ask the merchant to enter it manually.
Does each building have its own code? Large complexes and institutions often do; most residential streets share one code per delivery zone. Always look up the exact building rather than reusing a neighbor's code.
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