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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.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

Primary state prefixes. 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 package should still get delivered to the correct address, but it will probably take more time. Someone, a clerk probably, would have to look up the address and write the correct zip code on it, then send it back out to it's intended destination.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions.

A Zip Code is used to determine the exact location where parcels or mail must be delivered. What is a Postal Code? A Postal Code consists of numbers or a combination of numbers and letters that helps postal departments and courier services determine the exact place and region where mail must be delivered.

If you want to geocode U.S. ZIP Code data, you can use the US Address 5-Digit ZIP address locator style for creating a ZIP Code address locator based on a ZIP Code point reference feature class. The address locator is the main tool for geocoding in ArcGIS.

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.