In 2011, South Korea replaced its land-lot-based address system with a road-name-based system, followed by a postal code revision in 2015 that introduced a 5-digit format. Despite these changes, many people still use outdated 6-digit postal codes found in old documents, leading to delivery issues. To help resolve this, we developed a simple tool that converts old postal codes into the current 5-digit format and provides updated address information when available.
How the Tool Works
Users can enter an old 6-digit postal code into the search box. The tool will return the corresponding 5-digit postal code and, when available, the updated address.
Please note that:
- The conversion is not always one-to-one; some old codes may map to multiple or no exact matches due to administrative changes.
- Certain addresses may no longer exist in the current system due to regional restructuring.
- If no result is found, users can contact support via the inquiry form or reach out directly to Korea Post for official guidance.
Uses
This tool is a third-party service developed to assist users in looking up updated postal codes in South Korea. All postal data is sourced from Korea Post, the official postal authority. We do not provide logistics or delivery services. For questions related to shipping costs, parcel tracking, or delivery issues, please contact Korea Post directly. This tool is particularly useful for individuals working with outdated Korean addresses, businesses updating legacy databases, professionals in real estate or logistics, and international users unfamiliar with the current postal system.
As South Korea continues to modernize its infrastructure, understanding the updated postal system is essential. This tool aims to provide a convenient, accessible way to bridge the gap between old and new address formats. For further assistance, please contact our support team or consult Korea Post.
