ZIP+4 Codes

The 5-digit ZIP Code plus a 4-digit add-on number identifies a geographic segment within the 5-digit area, such as a city block, office building, high-volume receiver of mail, or any other distinct mail unit.

Those extra four digits not only entitle you to USPS bulk mailing discounts but also increase the speed of delivery by as much as 2 days and by the same token help you to uncover hidden trends and insights within your customer database.

With thousands of Zip Codes changes happening every year, its important to make sure you regularly update your zip code data with a database such our Zip+4 database, available as API or data.



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