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ZIP Codes denote street address groups or delivery routes. Because of this, ZIP Code "areas" can overlap, be contained within another ZIP Code, or have no geographic area. For example, ZIP Codes that start with 095 are assigned to the Navy and therefore have no geographic location.

There are no duplicate ZIP Codes. There are some ZIP Codes that are multi-part polygons, but those polygons are usually adjacent.

The function of the ZIP + 4® is to indicate a more specific area within a ZIP Code?, including the side of the street on which the building is located. The ZIP + 4® enables mail to arrive faster, as it reduces the need for human interaction in a mail center.

The four extra numbers are added after a hyphen to complete the ZIP+4. 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.

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.

When Amazon uses those numbers the POST OFFICE has assigned to each address, they get used to allow for faster and more accurate sorting of packages which is why Amazon is given a discount for using the numbers the POST OFFICE has added to the end of your Zip Code.

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

The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.