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Japan Postal Codes & Phone Area Query

Welcome to the Japan Postal Codes and Phone Generator directory. This portal indexes 47 major states/provinces in Japan. Select a region to explore local cities, street zip codes, neighborhood maps, and to generate simulated phone numbers conforming to local telecommunication network rules for QA and development.

Japan Country Code
47 Indexed Prefectures
7 Active Languages
🔍 Currently showing 47 prefectures

Prefectures

47
Aichi Akita Aomori Chiba Ehime Fukui Fukuoka Fukushima Gifu Gunma Hiroshima Hokkaido Hyogo Ibaraki Ishikawa Iwate Kagawa Kagoshima Kanagawa Kochi Kumamoto Kyoto Mie Miyagi Miyazaki Nagano Nagasaki Nara Niigata Oita Okayama Okinawa Osaka Saga Saitama Shiga Shimane Shizuoka Tochigi Tokushima Tokyo Tottori Toyama Wakayama Yamagata Yamaguchi Yamanashi

Frequently Asked Questions

Postal Code System
Japanese postal codes are 7-digit numeric codes with a hyphen in the middle (e.g., 100-0001). The first three digits represent the postal area/district, and the last four digits represent the specific town, building, street, or delivery point.
Dialing Format & Area Codes
Japan's country phone prefix is +81. Local phone numbers (including the area code, e.g., Tokyo's 03) are typically 10 digits in length starting with a leading 0 (the international format length is 9 digits after removing the leading 0), while mobile numbers (e.g., starting with 090) are 11 digits in length (the international format length is 10 digits after removing the leading 0).
What is the length and format of postal codes in Japan?
Postal codes in Japan consist of 7 digits with a hyphen (format: 100-0001). The first three digits represent the postal area or sorting center, and the last four represent the town, street, building, or large business entity.
How are telephone area codes structured and allocated in Japan?
Japan landline area codes are managed by the telecom authority, ranging from 2 to 5 digits (starting with '0', e.g., 03 for Tokyo, 06 for Osaka). The total length of a landline number (including area code) is 10 digits, while mobile numbers are 11 digits.
How do you dial a Japan phone number from abroad?
To call Japan, dial '+81', followed by the area code (without the leading '0') and the subscriber number. For example, to call Tokyo: +81 3 5555 5555 (domestic: 03-5555-5555).
Do postal codes and telephone area codes in Japan align geographically?
No, postal codes and telephone area codes are independently planned and managed by different authorities (the postal service vs. the telecom authority), so their geographic boundaries do not align directly. One area code usually contains hundreds or thousands of postal codes.
Why is the correct postal code critical for mail and package delivery in Japan?
The correct postal code is the core basis for modern logistics and automated postal sorting. Writing the correct postal code avoids misrouting, reduces sorting steps, shortens delivery times, and ensures precise delivery to specific blocks or buildings.
How can I verify if a Japan postal code or telephone area code is valid?
You can use the directory hierarchy on our website to browse states, cities, and districts to check the postal code and area code mapping. For official confirmation, you can consult the official postal service or telecom authority of that country.