What Is a 4-Digit ZIP Code Extension and How Does It Work?
Learn what a 4-digit ZIP+4 code is and how it helps the USPS deliver mail more precisely to specific addresses or buildings.
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A 4-digit ZIP code extension (often called a ZIP+4 code) provides more precise information about a mailing address by identifying a specific segment within the ZIP code, such as a side of a street, a building, or an individual high-volume receiver of mail. You can usually find this extension by looking up an address on the U.S. Postal Service’s website or by checking any recent mail you've received that might include the full ZIP+4 code.
FAQs & Answers
- What is the purpose of a ZIP+4 code? A ZIP+4 code provides a more precise location within a standard ZIP code, such as a specific building, side of the street, or high-volume mail receiver, improving mail sorting and delivery accuracy.
- How can I find the ZIP+4 code for my address? You can find your ZIP+4 code by using the U.S. Postal Service’s online ZIP code lookup tool or checking recent mail that includes the full ZIP+4 code.
- Does using a ZIP+4 code speed up mail delivery? Yes, using the full ZIP+4 code helps the postal service process and deliver mail more efficiently by pinpointing the exact delivery segment.