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The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.

A 5-digit number that identifies a particular postal delivery area in the United States.

If you write the correct address but the wrong zip code, your package may go to the same address at the zip code you wrote, it may go to the correct address, or it may be marked undeliverable and returned.

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.

Zip code refers to a type of postal code and is used primarily in the United States and the Philippines. The postal code, however, is typically utilized by the rest of the countries scattered throughout the world.

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.

Apply a predefined postal code format to numbers Select the cell or range of cells that you want to format. On the Home tab, under Number, on the Number Format pop-up menu. , click Custom. In the Format Cells dialog box, under Category, click Special. In the Type list, click Zip Code or Zip Code + 4.