Data Files
03/09/2026
Area District Finance File (AREADIST.TXT)
Data Files
03/09/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
03/09/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
03/06/2026
INFORMATIONAL - Commercial System Releases – March 8, 2026
Release Notes
03/06/2026
PTR2 Release Notes_DD_03_07_26
Announcements
03/06/2026
INFORMATIONAL- 2026 National Postal Forum - Workshop Schedule Is Available Online
FAQs
03/06/2026
USPS PTR2 API Known Issues
Announcements
03/05/2026
INFORMATIONAL - End of USPS Web Tools Tracking 3.5.26
Contact Lists
03/05/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
03/05/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.