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Your zip code is a short sequence of letters and numbers at the end of your address, which helps the post office to sort the mail.

A letter without a ZIP code may not reach its intended destination. That is because of the way addresses are read by automated postal systems. Rules that are taken for granted when people send mail are actually unusually strict to increase post office efficiency. Processing machines read addresses from the bottom up.

The USPS provides a free ZIP+4 code lookup tool on their website that can be used to find accurate and up-to-date ZIP+4 codes for specific addresses. By using this tool, individuals and businesses can ensure that their mail is delivered to the correct location in a timely and efficient manner.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

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.

What each number means. The first digit designates a broad area, which ranges from zero for the Northeast to nine for the far West. The two following digits are the code of a central post office facility in that region. The last two digits designate small post offices or postal zones.

A credit card ZIP code is the 5-digit zip code from your U.S. billing address. When you make a purchase, the ZIP code you enter must match the ZIP code associated with your official cardholder address.

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.

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.

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 code??two words with ?ZIP? in all caps?but it uses a lowercase C, and I was surprised it would deviate.