Early Warning System (U.S. Only)

The USPS provides free Early Warning System (EWS) data to prevent matching errors due to the age of the address information in the .gsd files. The USPS creates a new EWS data set each week that you can download from the USPS website (https://postalpro.usps.com/cass/EWS).

To install the Early Warning System (EWS) database rename the database file from OUT to EWS.txt and place it in the same folder as the primary database.