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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. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.

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

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, or a post office box.

What is the difference between 5-digit zip codes and 9-digit ZIP codes? Full 9-digit zip code contains additional details more directly targeting where the mail is to be delivered: 5-digit = the post office to deliver the addressed mail. 9 digit = street or building, side of the street or floor number.

ZIP Codes are 5-digit numbers developed by the United States Postal Service to represent individual post offices across the United States. "ZIP Code" is the name of the postal code system for the United States.

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.

There are two types of ZIP codes used in the United States: five-digit (or standard) and nine-digit (or extended). Standard ZIP codes are used in most parts of the country, while nine-digit ZIP codes are used primarily in rural areas.

ZIP codes, the postal code system used by the US Postal Service (USPS), were introduced in 1963. Their basic, and most familiar, format consists of five digits that indicate a specific delivery area. In 1983, the USPS introduced the extended ZIP+4 code.

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.

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