A five-digit system is being introduced, but its use is still not universal. The additional digits in the new system are a delivery code and are separated from the older sorting code by a hyphen. The postcode comes at the end of the domestic address. A hundred or so large organizations and high-volume mailers have their own postcodes. The English phrase PO Box is used, usually without punctuation.
Boxes are rather rare in postal addresses.
The Japanese refer to their country as Nihon or Nippon . Learn more about conducting business overseas.