Japan Postal Code Lookup
Enter a Japan postal code to check its format, view area-level sample data, and generate a fictional test address for that area.
150-0002 Synthetic test address for this area
150-0002 Tokyo Shibuya 5801 Jinnan 3-chome Japan
Japan postal code format notes
Japanese postal codes use three digits, a hyphen, and four digits.
Can a postal code show a specific address?
Usually no. A postal code typically identifies a postal area, locality, or delivery range. It should not be presented as a specific street and house number without licensed address data.
Postal area data source
GeoNames · Imported: 2026-06-29 · 146,447 area records
- GeoNames postal code data — GeoNames · Creative Commons Attribution
Japan postal code lookup FAQ
Can a Japanese postal code show a specific street address?
Usually no. A Japanese postal code typically identifies a postal area, locality, or administrative region. It should not be treated as a specific street and house number.
Is this postal lookup official delivery verification?
No. This tool uses GeoNames area-level postal data and local samples for format learning, QA, and test data. It does not guarantee deliverability.
Why can a valid postal code return no area result?
Format validation only checks the visible structure. Area results depend on the current dataset coverage; unmatched values are shown as format-only results.
Can I generate a test address from a postal lookup result?
Yes. When an area-level match is found, the page can generate a fictional test address for forms, imports, and development workflows. It is not a real address claim.