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The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

What does ZIP mean? ZIP is an acronym for Zone Improvement Plan. However, the USPS intentionally chose the acronym to indicate that mail travels more quickly when senders mark the postal code on their packages and envelopes.

Also called plus-four codes, add-on codes, or add-ons, the ZIP+4 code starts with the standard five-digit ZIP Code. 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.

ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

There are three main parts of the 5-digit ZIP Codethe national area, the region or city, and the delivery area. The United States Postal Service (USPS) has segmented the country into 10 ZIP Code areas.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. The first number of the five-digit code signifies the region which the address is located in, a number that grows from the east coast to the west.

Since our caller works for the U.S. government, and ZIP codes are a government thing, I checked the US Printing Office style guide first. It recommends ZIP Code. Associated Press style is similar: ZIP codetwo words with ZIP in all capsbut it uses a lowercase C, and I was surprised it would deviate.