5 fastest and most popular ways to find postal codes in Japan 2025

Are you living, studying or working in Japan and often have to fill in information when shopping online, registering for services or doing administrative procedures? One of the common questions of Vietnamese people is How to find postal code in Japan quickly and accurately. This may seem like a small thing but it is very important, because filling in the wrong postal code can cause the order to be delivered late or the file to be returned. In this article, T-Connect will share 5 simple and most popular ways to find postal codes in Japan so you can easily look up postal codes, making life in the cherry blossom country more convenient.

What is the postal code in Japan?

Postal Codes in Japan (郵便番号 – yūbin bangō) is a 7-digit number, usually written in the format XXX-XXXX. This is the system used by Japan Post to divide geographical areas, helping to transport letters, parcels and goods more quickly and accurately.

For example, the postal code for Shinjuku (Tokyo) is 160-0022, and for Namba (Osaka) is 542-0076.

In addition to sending and receiving mail, postal codes are also necessary when you:

• Fill in the address on online shopping websites.
• Register for telecommunications and banking services.
• Complete administrative paperwork in Japan.

In other words, knowing how to find postal codes in Japan will help you save time, reduce errors and make your daily life more convenient.

Top 5 most popular ways to find postal codes in Japan

In fact, there are many ways to find postal codes in Japan, from online tools, mobile applications to looking up directly at the post office. Below are the 5 most popular and effective ways in 2025, helping you easily look up and use postal codes accurately.

Japan Post Website

The official website of Japan Post is the most accurate source of information. Here, you can enter a specific address (province, district, ward, street name) and immediately receive the corresponding 7-digit postal code. In addition, the website also allows you to do a reverse lookup, that is, enter the code to see the area details.

Instructions on how to find postal codes in Japan on Japan Post:

• Go to page Japan Post – 郵便番号検索
• Select search by address (住所から探す) or by postal code (郵便番号から探す)
• Enter the name of the prefecture/city (eg: Tokyo – 東京) + ward/ward
• Click the search button → Results show 7-digit postal code

Google Maps

Google Maps not only provides directions, but is also a very convenient tool for finding postal codes. When you enter an address, the information displayed usually includes the postal code right below it. This is a quick way to find postal codes in Japan, especially useful for beginners who are not familiar with Japanese.

Instructions on how to find postal codes in Japan using Google Maps:

• Open the Google Maps app on your phone or web
• Enter the address you are looking for (e.g. “Shinjuku Tokyo”)
• See details shown below → there will be a postal code with the address

Mobile application

If you want to check frequently, download the Japan Post app or utility apps like Yahoo! Map, Rakuten, NAVITIME. These apps have built-in features to find postal codes directly, just enter the address or use GPS to determine the area.

Some popular apps to find postal codes in Japan:

• Japan Post App (日本郵便アプリ)
  • Download the app from the App Store or Google Play
  • Select “Zip Code Lookup” (Zip Code Lookup)
  • Enter address or postal code → system returns detailed results
• Yahoo! Map / NAVITIME / Rakuten
  • Search address in app
  • Postal code will be displayed with location information

Invoices, administrative documents

A simple way that many people often overlook is to look at your electricity, water, gas, internet bills or administrative documents. Most documents in Japan have your postal code printed on them. This is a convenient solution if you live at a stable address for a long time.

How to find postal code in Japan on paper:

• Check the address printed on the electricity, water, gas, internet bill
• On the top left corner or right on the address line there is usually a 7 digit zip code (for example: 160-0022)

Nearest post office

If you’re still having trouble, the safest option is to go directly to your local post office. Postal workers will provide accurate information and may be able to provide additional guidance on addressing, mail handling, or regulations. This is a reliable option for those who are not familiar with technology.

How to find postal code in Japan at post office:

• Find a post office near you using Google Maps with the keyword “郵便局”
• Bring the address you need to look up (write it down on paper)
• Give it to the post office staff and ask them to look up the correct postal code.

Some common postal codes in Japan

Japan has a very detailed postal code system, divided into each neighborhood. However, there are postal codes that are often mentioned because they are associated with large cities, commercial centers, tourist centers or places where many foreigners live. Knowing the following common postal codes in advance will help you more conveniently when filling in your address or sending and receiving goods:

• Tokyo (Shinjuku): 160-0022 → The busiest administrative and commercial center of Tokyo.
• Tokyo (Shibuya): 150-0002 → Famous for Shibuya Crossing and modern shopping district.
• Osaka (Namba): 542-0076 → The most bustling entertainment and culinary area in Osaka.
• Kyoto (Gion): 605-0074 → Traditional old town, famous for Geisha culture.
• Nagoya (Naka-ku): 460-0008 → The commercial and administrative center of Nagoya city.
• Fukuoka (Hakata): 812-0012 → A major trading gateway in Kyushu, many Vietnamese people live there.
• Sapporo (Chuo-ku): 060-0001 → Hokkaido's largest city, famous for its snow festival.

Notes when looking up postal codes in Japan

The postal code system in Japan is quite detailed, sometimes confusing for beginners. To make the lookup more accurate and convenient, you should note the following points:

• Always fill in 7 digits: in correct format XXX-XXXX. Example: 160-0022 (Shinjuku, Tokyo).
• Don't confuse general and detailed codes: A city/county can have different codes depending on the neighborhood. Make sure you get the correct code for your specific address.
• Check carefully before entering information online: If you enter an incorrect postal code, your order may be delayed or not arrive at all.
• Use official tools: You should prioritize the Japan Post website or search app for the highest accuracy.
• Distinguish between personal and corporate addresses: Some large office buildings or shopping malls in Japan have separate postal codes.
• Update regularly if you move house: When you change your residence, please keep a record of your new postal code for use in administrative services and deliveries.

Experience for Vietnamese when filling in postal codes

For Vietnamese people who have just arrived in Japan, filling in the correct postal code not only helps letters and goods arrive quickly but also affects the process of registering for telecommunications services, banking or administrative procedures. Below are some practical experiences you should note:

• Save your postal code: Make a note in your phone or notebook of the zip code of your current accommodation, dormitory or apartment so you can fill it in when needed.
• Copy & Paste when shopping online: Create a “personal note” with full address + zip code, so you just need to copy and paste when ordering to avoid mistakes.
• Read the accompanying documents carefully.: If you sign up for electricity, water, internet or telecommunications services (such as T-Connect), please check the pre-printed postal code on the contract to enter it correctly.
• Don't just memorize the city code: Each ward, city, and even small neighborhood in Japan has its own code. Don't be confused by just using the general city code.
• Ask an acquaintance or the post office: If you are unsure, ask Vietnamese friends who have lived in Japan for a long time or ask the post office staff to help you check.
• Check before sending: When filling out administrative forms or orders, double-check 2–3 times to make sure there are no missing or incorrect numbers.

Here is a detailed guide on how to find the postal code in Japan quickly and accurately in 2025. From the Japan Post website, Google Maps, mobile apps to bills and the nearest post office, you can flexibly choose the method that suits your needs. Filling in the correct postal code will make online shopping, shipping, registering for telecommunication services or doing administrative procedures in Japan easier and more convenient.

Especially, if you are Vietnamese living in Japan, don't forget to check out the telecommunications services of T-Connect, a reliable companion, always supporting to make life in the land of cherry blossoms simpler and more convenient.