This is an online tool (Mashup) to search postal code of a place, address or city in Japan.
Select the name of the Place/Address/City (in Japan) from the suggested list.
This will display the postal code of the selected location from Japan on Google map. Note that the postal code may be searched with nearby approximation.
Below is the select list of some major cities from Japan. Click on the "Show Postal Code" button to go get its postal code.
Note that many cities from Japan may have multiple localities in it, so the clicking on "Show Postal Code" below may only show postal code of central locality.
For specific locality/address, you need to select its name in the above text box.