Melissa Knowledge Center

Access resources and solutions to visualize & understand your data.





What is a Vacant Address?

Discover the definition and significance of vacant addresses. Learn how vacancy flags impact business and choose the right address solution for your...

Unique Identifier

Unique ID’s in the US

Are you looking for a unique value to identify addresses in the USA? Here, we cover the pros and cons of USPS data and look at alternatives

Unique Identifier

Unique ID’s in the UK (UPRN/UDPRN)

Discover UK's Unique Address Identifiers (UPRN/UDPRN) tracing properties, addresses & boundaries for precise location insights.


What is a No-Stat Address?

The USPS considers no-stats as inactive addresses that are unlikely to receive mail, and sending mail to an inactive address costs valuable time and...


Military Addresses

Learn the basics of U.S. military addresses to ensure smooth & accurate delivery of letters and packages to those who serve


Early Warning System (EWS)

The Early Warning System (EWS) flags streets not yet included in ZIP+4 reference data and makes sure that addresses are not inaccurately coded or...