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Writer's pictureJoan Welche

How Do I Find My Zip 4 Code?

A ZIP+4 code is an extension of a ZIP code and is often used on high-volume addresses. It is used by the US Postal Service to sort mail according to address and delivery area. The USPS introduced the ZIP+4 code in 1983. It contains the first four digits of the zip code followed by a hyphen and four additional digits that specify the locality, state, and city. These codes can help identify mail from multiple addresses and are easier to read and process.



A ZIP+4 code is a four-digit code that is added to a traditional ZIP Code to allow for faster mail delivery. The last four digits represent a segment of a delivery route, typically 10 to 20 mailboxes. A ZIP+4 code helps the USPS know more the address of a recipient and the best route to take for the mail to arrive on time.


A ZIP+4 code is also used for a street address. For example, a street in Anytown, NY contains 40 houses, each with a different ZIP+4 code. There are two households at addresses 8-16, while numbers eight and nine are multi-family units. In contrast, number twelve is owned by the Moneybagges, who live on one side of the street.


The ZIP+4 code is used to help USPS sort mail by location. It is an essential part of USPS mail delivery. The first three characters of a ZIP+4 code represent the location of a specific post office or city. If you have an address in an area with several post offices, the ZIP+4 code will help the USPS to route mail to the right recipient.


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