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Universal Postal Union - How to write addresses

From that website: Use this guide and you can be certain that your address will be written correctly, ensuring that Posts worldwide process your mail fast and efficiently. If you have any specific requirements, please select a country to obtain more detailed information.

Very useful for writing addresses on mail to other countries: When you select a country you get a PDF file explaining how to write a proper address, including peculiarities that specific country might have and explaining how for example the postal code is constructed.

If you click around on that site you'll find other interesting stuff like postal statistics.