What are the Last 4 Digits of my ZIP code?

ZIP codes play a crucial role in ensuring the efficient sorting and delivery of mail by the United States Postal Service (USPS). Comprising five numerical digits, ZIP codes help route mail to its intended destination quickly. However, you may have noticed that some addresses include an additional four digits following the standard five-digit ZIP code. What do these last four digits represent?


Known as the ZIP+4 code, these additional digits provide a more precise location for the delivery address. The first two digits of the ZIP+4 code narrow down the delivery area further, often indicating a specific building or segment within the broader five-digit ZIP code region. The last two digits offer even more precision, pinpointing the exact address or location within the specified area.

While the standard five-digit ZIP code is essential for general routing, the ZIP+4 code facilitates a more accurate and efficient delivery process. It is particularly useful in densely populated areas or locations with numerous addresses, where the extra digits help postal workers identify the specific delivery point with greater precision.

In summary, the last four digits of your ZIP code, known as the ZIP+4 code, provide a more detailed and accurate identifier for your delivery address. While not always required, including the ZIP+4 code can enhance the efficiency of mail sorting and contribute to the timely delivery of your mail.


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