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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.

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.

The basic ZIP code is made up of five numbers. An extended ZIP + 4 code includes the five digits of the ZIP code, a hyphen and then four more digits. This lets a piece of mail to be sent to a more exact location than by the ZIP code alone.

A ZIP+4 Code is a 4-digit code appended to a standard 5-digit ZIP that helps the USPS sort, route, and deliver mail more efficiently. The last 4 digits of these 9-digit ZIP Codes usually represent 6-20 delivery points on a USPS carrier route.

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.

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps 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, or a post office box.

ZIP & ZIP+4 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.

What to Know Zip codes: Use the USPS Zip Code Lookup tool, or search Google or Bing. Find area codes: Type the city and state name, along with area code, into Google, Bing, Yahoo, or Wolfram Alpha. Or, use a specialized website like Area Codes, Country Codes, LincMad, or AllAreaCodes.com.

The correct ZIP+4 decreases the number of times a piece of mail is handled, too. This means that misdelivery or error is significantly reduced as a result. Since ZIP+4 codes are based on delivery routes, this information can change as frequently as once every two months.

ANSWER: The two codes are essentially the same in their purpose, but the term Zip code is mainly used in the USA; Postal Code is commonly used in other countries.