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You are right that the United States Postal Service writes ?ZIP Code? with a capital C?and ZIP in all caps. You're also right about us. Though CMOS doesn't specifically rule on how to capitalize the term, it has rendered it as ?zip code? (all lowercase) since it first appeared in the Manual in 1982 (in the 13th ed.).

The highest ZIP Code number is 99950 in Ketchikan, AK.

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.

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 ZIP+4 code is used and assigned by the United States Postal Service (USPS) for routing purposes. The final 4 digits are not required for delivery of your mail and may change frequently.

It's important to note that the ZIP+4 codes are only appended to the original 5-digit USPS® Zip Code after the address has been validated and standardized. Why do these added 4 digits matter? These additional appended numbers help to ensure the quickest and most accurate mailing process possible.

The four extra numbers are added after a hyphen to complete the ZIP+4. 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.

Four-Digit Extension It represents a specific delivery route within that overall delivery area. For PO boxes, the four-digit extension usually includes the PO box number. Including the last four digits means mailings will arrive to their intended destination faster, as well as discounts on bulk mailings.