In this platform we seek to encourage the use of postal code in Japan. You can navigate by states, then cities and neighborhoods until you find the zip code of your area.
In addition to the address itself, all locations in Japan have a postal code. After the reform of 1998, this begins with a three-digit number, a hyphen, and a four-digit number, for example 123-4567. A postal mark, 〒, may precede the code to indicate that the number following is a postal code.