📮 Japan Postal Code Search

What is a Postal Code: A 7-digit number assigned by Japan Post for mail delivery.

How to Use:
1. Enter postal code (with or without hyphen)
2. Click search button
3. Prefecture, city, and town will be displayed

Postal Code Format:
• 7-digit number (e.g., 1000001)
• With hyphen (e.g., 100-0001)

Note: One postal code may correspond to multiple towns. Large business facility individual postal codes are not supported.

Data Source: This search uses external API. For accurate information, please check Japan Post official website.

History and Overview of the Postal Code System

Japan's postal code system was introduced on July 1, 1968. Originally a 3-digit or 5-digit number, it transitioned to the current 7-digit system on February 2, 1998. This system was introduced to streamline mail delivery and enable sorting by automatic reading machines. The 7-digit postal code is written in the format "〒○○○-○○○○," where the first 3 digits indicate the region and the last 4 digits indicate a more detailed delivery area. Approximately 120,000 postal codes are assigned across Japan, playing an important role in identifying addresses.

Structure and Meaning of Postal Codes

Each of the 7 digits of a postal code has meaning: for example, in the case of postal code "100-0005" for Marunouchi, Chiyoda-ku, Tokyo, "100" indicates central Tokyo and "0005" identifies the Marunouchi district.

Types of Postal Codes

Japanese postal codes mainly come in the following types: general postal codes representing regions, individual postal codes assigned to large business facilities, and postal codes for P.O. boxes.

The Correct Way to Write Postal Codes

The correct method when writing a postal code: officially, the postal code is written before the address. Example: "〒100-0005 1-1-1 Marunouchi, Chiyoda-ku, Tokyo."

How to Use Postal Code Search

The postal code search tool can be used in situations such as: entering addresses for mail order or online shopping, confirming recipients for New Year's cards or letters, confirming the address of a new home when moving, and accurate address entry in business documents.

The Relationship Between Postal Codes and Delivery Time

Postal codes are also important for knowing the estimated delivery time. With Japan Post, the number of days required for delivery varies by postal code: using express or special delivery can shorten delivery days. For important documents, we recommend using postal products with tracking services.