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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.

Because they are based on delivery routes instead of more permanent boundaries, the last 4 digits of a complete ZIP code can change often. Five-digit ZIP codes also change, but they do so infrequently.

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.

What Is a ZIP Code, and How Do ZIP Codes Work? ZIP Codes Beginning WithStates / Territories4Indiana, Kentucky, Michigan, Ohio5Iowa, Minnesota, Montana, North Dakota, South Dakota, Wisconsin6Illinois, Kansas, Missouri, Nebraska7Arkansas, Louisiana, Oklahoma, Texas6 more rows

Are zip codes ever deleted from use? Over 1,000 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.

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 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.