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A ZIP Code is a 5-digit number that specifies an individual destination post office or mail delivery area. ZIP codes determine the destination of letters for final sorting and delivery. Each ZIP Code designates a collection of delivery routes used by mail carriers and areas serviced by the USPS.

You are right that the United States Postal Service writes ZIP Code with a capital Cand 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 address you are mailing to should be written as follows: Recipient's name. Business's name (if applicable) Street address (with apartment or suite number) City, State and ZIP code (on the same line) Country

Standard US ZIP codes The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.

A ZIP+4 code uses the basic five-digit code plus four additional digits 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, a post office box, or a specific delivery route meaning the actual path the mail truck

The current postal codes in the United States range from 00001 99950. The lowest and highest of these postal codes are both specific to areas in Alaska; The 00001 code is for the N Dillingham area, and the postal code 99950 is for 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.