South Korea uses a 5-digit postal code system introduced in 2015. Whether you're receiving international packages, filling out forms, or sending mail, knowing how to find and use the correct postal code is essential.
1. How to Find Your Korean Postal Code
The fastest way is to search your address on this site. The 5-digit postal code is displayed alongside your road address and English translation — no separate lookup needed.
2. Understanding the 5-Digit System
The first two digits of a Korean postal code indicate the broad region:
| Prefix | Region |
|---|---|
| 01–09 | Seoul |
| 10–23 | Gyeonggi-do |
| 26–27 | Incheon |
| 48–50 | Busan / Ulsan / South Gyeongsang |
| 63 | Jeju Island |
3. Old 6-Digit vs. New 5-Digit Codes
Before August 2015, Korea used a 6-digit format (e.g., 135-080). These are now obsolete. Always use the 5-digit format (e.g., 06236). Entering an old code may cause errors in delivery or form validation.
4. Where to Put the Postal Code in English Addresses
In English format, the postal code comes after the city/state and before the country name:
152 Teheran-ro, Gangnam-gu, Seoul 06236, South Korea
When filling in online forms, enter only the 5 digits in the ZIP/Postal Code field — no hyphens.