Contact Lists
05/29/2025
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
Contact Lists
05/29/2025
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
05/29/2025
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
05/29/2025
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

Data Files
05/29/2025
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File

Data Files
05/29/2025
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

 

Tools
05/28/2025
Financial Audit Reporting Tool v3
Data Files
05/28/2025
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
05/27/2025
DELIVERY: WestPac Area: AZ-NM District Oracle Post Office (85623) – Resume Operations
Release Notes
05/27/2025
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.