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Writer's pictureOkija Arban

Using the Last 4 Digits of Zip Code to Identify a Location

The United States Postal Service (USPS) uses ZIP Codes to identify a specific location. The basic format was initially five digits long, but in 1963 the USPS added an additional four digits, called the ZIP+4 code. This combination designated a more specific location. Now, ZIP+4 codes are used worldwide.



Using a ZIP+4 code boosts delivery accuracy and speed. It is used to ensure delivery to specific addresses. A typical delivery route includes between 10 and 20 addresses. The postal service also offers delivery to PO boxes, which often have a ZIP+4 code that matches the box number. When shipping packages, you need to make sure to include the full ZIP+4 code. It is also important to know that you need to include the complete address when preparing mail.


In the United States, there are 41,683 ZIP Codes. The first five digits are used to specify a post office's destination. The remaining four digits are used to identify delivery routes within a delivery area. Generally, a postal service delivers mail to a ZIP+4 code when it can't reach a particular neighborhood.


Using a ZIP+4 code is important because it is much more difficult to send or receive packages if a delivery route has a longer ZIP code than a five-digit ZIP code. In some cases, the last four digits of a ZIP+4 code can change every month.


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