Data Files
04/13/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
04/13/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
04/10/2026
INFORMATIONAL - July 2026 Market Dominant Price Change Filing Webinar - Friday, April 17, 2026
Announcements
04/10/2026
DELIVERY - Southern Area - AR-OK District - Wilton Post Office (71865) - Permanently Suspended
Announcements
04/10/2026
INFORMATIONAL - Time Limited Price Change 2026 Commercial System Releases – April 12, 2026
Announcements
04/09/2026
INFORMATIONAL - U.S. Postal Service Recommends New Prices for July
Release Notes
04/09/2026
PTR2 Release Notes_DD_04_07_26
Contact Lists
04/09/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
04/09/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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

Contact Lists
04/09/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)