http://www.embassyworld.com/data/Zip_Codes.html

You will find the country codes and 35 city codes for Japan at this site:

http://411web.whitepages.com/search/Find_Intl_Code?country_id=JP

With the exception of major roads, Japanese streets are not named. Instead, cities and towns are subdivided into areas, subareas and blocks, similar to the insulae system of the Roman empire. To complicate the matter, houses within each subarea were formerly not numbered in geographical sequence but in the temporal order in which they were constructed.

If addresses are written in Japanese, they start with the postal code, followed by the prefecture, city and subarea(s), and end with the recipient’s name. If addresses are written in English, they start with the recipient’s name and end with the prefecture and postal code.

http://www.japan-guide.com/e/e2224.html

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