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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.

Usually what happens is a carrier or post master from the office where the package is sent will correct the zip code by looking at the address and even reach out to that particular post office to ensure the package is delivered to the correct address.

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.

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.

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.

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.