Overview
Postal Code Query supports two search modes: reverse lookup by postal code and postal code search by address keywords. It is useful for shipping forms, form completion, customer data cleanup, and everyday lookup tasks.
Key Features
- Reverse lookup province, city, district, and street details by 6-digit postal code
- Search postal codes with province, city, district, and street keywords
- Display multiple matches and copy one item or the full result list
- Run with security verification and the built-in postal code dataset from this project
How to Use
- Choose the code-to-address or address-to-code tab
- Enter a 6-digit postal code or address keywords such as province, city, district, or street
- Start the search and copy the record you need from the results list
Query Tips
- Reverse Lookup: Best for shipping forms, address verification, and form completion when one postal code maps to multiple areas.
- Keyword Search: Use province, city, district, street, neighborhood, or landmark keywords to quickly narrow postal code matches.
- Data Source: Results are returned from the built-in postal code dataset in this project for daily lookup and data cleanup.
FAQ
Why can one postal code return multiple results?
One postal code can cover multiple streets, districts, or address ranges, so multiple related records may be returned.
What should I do if address keyword search returns nothing?
Try shorter and more common keywords first, especially province, city, district, or street combinations.
Where does the query data come from?
The results come from the built-in postal code data file included in this project and do not rely on a third-party address lookup API.