The zip 4 code is the last four digits of a nine-digit ZIP code, and it's used to speed up mail delivery. The USPS uses this extra information to ensure that mail is sorted and delivered correctly to the correct destination.
A 9-Digit ZIP+4 code is an appended code to a 5-digit ZIP Code. It identifies a smaller area 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.
This information is key to the USPS's Zone Improvement Program system that enables the postal service to sort and deliver mail more efficiently. The addition of the extra four digits helps to prevent lost, misdelivered, and delayed mail.
There are many ways to find the last four digits of a 9-digit zip code. One of the most simple and effective methods is by using an online address lookup tool. These services will provide detailed information on a specific address such as county and city name, latitude/longitude, Congressional district, and more.
When you're looking for the last four digits of a zip code, make sure to check with the local post office to ensure that you have the right address. If you don't, your letters could be sent to the wrong location and your customers may never see them.
The USPS maintains a database of over 34 million residential ZIP+4 codes in TIGER/Line Shapefiles and AIS Zip+4 National data set. These geocoded ZIP+4 data sets are highly authoritative and accurate, meeting research quality standards as well as mission-critical business needs.
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