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The main difference between zip code and postal code is that zip code is used as a code in United States while postal code is used in rest of the world. ZIP Code. ZIP code is postal code system that is being used by U.S. Postal Service (USPS) since 1963.
A zip code is a five or nine digit numerical code that is assigned  to a specific region of the United States. It is used to quickly  sort mail to send it to its destination â¦ .    It is similar to a post code in the UK.You write it in the address  of where you are sending the item.    The postal codes used in the Philippines are also called Zip Codes,  but they are a completely separate system. Many other countries  have postal codes, but it is incorrect to call them zip codes..nother answer, which is probably the one that has to do with zip codes: Dictionaries say that  â¦ zip in zip code is from the initial letters of zone improvement plan.. Zip was also already a word meaning to cause to go fast.. So zip code means a zone improvement plan that causes mail to go fast..