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.
Full Regional Postal Code Breakdown
| Prefix | Region |
|---|---|
| 01–09 | Seoul (서울특별시) |
| 10–23 | Gyeonggi-do (경기도) |
| 24–25 | Gangwon Special Autonomous Province (강원특별자치도) |
| 26–27 | Incheon (인천광역시) |
| 28–29 | Chungcheongbuk-do (충청북도) |
| 30–31 | Sejong / Daejeon (세종특별자치시 / 대전광역시) |
| 32–34 | Chungcheongnam-do (충청남도) |
| 35–39 | Jeonbuk Special Autonomous Province (전북특별자치도) |
| 40–47 | Jeollanam-do / Gwangju (전라남도 / 광주광역시) |
| 48–50 | Gyeongsangnam-do / Busan / Ulsan (경남 / 부산 / 울산) |
| 51–59 | Gyeongsangbuk-do / Daegu (경상북도 / 대구광역시) |
| 63 | Jeju Special Autonomous Province (제주특별자치도) |
Why Korea Changed to 5 Digits in 2015
Before August 2015, Korea used a 6-digit hyphenated format (e.g., 135-080). The old system grouped codes by mail sorting center, not by geographic region — making them harder to memorize and use for navigation. The 2015 reform introduced a geography-based 5-digit system that groups codes by region (first two digits) and gradually narrows down to individual buildings. This aligns Korea with international standards and makes postal codes genuinely useful for identifying approximate location.