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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.

Valid US ZIP Code Pattern US ZIP code (U.S. postal code) allows both the five-digit and nine-digit (called ZIP + 4) formats. E.g. a valid postal code should match 12345 and 12345-6789, but not 1234, 123456, 123456789, or 1234-56789.

So, USPS created 9-digit ZIP Codes to ensure fast and accurate mailings. They indicate the actual path the mail should travel and usually they narrow down to somewhere between ten to twenty homes. Let's take the address of the Empire State Building in New York City as an example: 350 Fifth Ave, New York, NY 10118.

ZIP & ZIP+4 United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area. The first digit in a ZIP code represents a defined group of U.S. states.

Zip codes are used in the Philippines and the United States. Postal codes are used in all countries other than the Philippines and the United States. It is used to categorise regions in order to ease mail sorting, and it indicates the place to which the mail should be delivered.

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.

A 9-Digit ZIP code, also known as a ZIP+4 code or an extended ZIP code, includes the same information as the 5-Digit ZIP code, plus additional information about a specific delivery route within the delivery area.