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A 5-Digit ZIP code represents a USPS delivery area. A 9-Digit ZIP code, also known as a ZIP+4 code or an extended ZIP code, includes the same information as the 5-Digit ZIP code, plus additional information about a specific delivery route within the delivery area.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

The most basic way to sort ZIP codes in Excel is to use the "Sort" function. To do this, select the column containing your ZIP codes, then click on the "Data" tab and select "Sort A to Z" or "Sort Z to A" depending on whether you want to sort in ascending or descending order.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Is the hyphen in a ZIP+4® ZIP Code? number required? Yes, when using a ZIP+4 ZIP Code, the number must consist of five digits, a hyphen (or dash), and four digits.

Once it gets sorted there, it will either get looked up to find the correct zip code and be sent to the correct location. Or it may get stamped ?Undelivered? and the item will be returned to sender.