ZIP code vs. ZIP+4®

Definition:

ZIP + 4^® is the standard USPS^® 9-digit ZIP Code™. At this level of granularity, only a handful of addresses share the same postal code, making delivering letters and packages to the correct address a whole lot easier.

The function of the ZIP + 4^® is to indicate a more specific area within a ZIP Code™, including the side of the street on which the building is located. The ZIP + 4^® enables mail to arrive faster, as it reduces the need for human interaction in a mail center.

Unfortunately, the majority of people do not know their '+4' and cannot provide it when asked either in forms or over the phone.

How ZIP +4 are used

Adding the last 4 digits helped divide addresses into different "zones" which helped how mail was distributed and helped advance the sorting and delivery process, making it quicker and more efficient.

How do I find my ZIP +4?

The Experian Data Quality suite of products adds the ZIP + 4^® to every recognized address. This comprehensive data quality solution enables companies to capture accurate and complete addresses in nearly every instance, saving time and money by getting addresses right the first time they are taken.

Related links:

Read more about Experian Data Quality's address verification solutions.
Read more about the Experian Data Quality's real-time address verification for websites.
Read more about the Experian Data Quality's address cleansing service.
Read more about TIGER ZIP +4®.
Learn more about ZIP +4 verification software.
Read more about ZIP Code™ standardization software.
See what ZIP Code™ validation is about.