User Guides
03/08/2006
USPS-LR-L-61

This study provides comprehensive information on the volume, characteristics, and costs of Undeliverable-As-Addressed (UAA) and Personal-KnowledgeRequired (PKR) mail and on addressing deficiencies by rate category and applicable mail processing category.

Applications/ Forms
12/01/2005
Electronic Address Sequencing (EAS) Processing Acknowledgement Form (PAF)

A mailer or a party acting on behalf of a mailer (Mailer), who submits an address list to the United States Postal Service (USPS) for Level 3 Address Sequencing Service must complete the this processing acknowledgement form (PAF).

Tech Guides
04/28/2005
Announcements
02/17/2005
Footnote Code Changes

As presented at the CASS PIT meeting on February 17, 2005, there are some changes to the Footnote codes and how to process records when there is no delivery type on a match. We would like to clarify the changes to the Footnote codes.

Announcements
11/08/2004
Letter to CASS™ Vendors

The USPS® Address Management office has determined that there is a small percentage of addresses that will produce a false positive match when presented to the DPV™ Split File Product.

Data Files
Labeling List File *Moved*

Please note that this file has been moved to https://postalpro.usps.com/operations/labeling-lists/changes-september-2025. We apologize for the inconvenience.