Data Files
07/06/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
07/02/2026
INFORMATIONAL: USPS APIs System Deployment - July 11, 2026
Announcements
07/02/2026
INFORMATIONAL: USPS APIs System Deployment - July 19, 2026
Announcements
07/02/2026
DELIVERY: WestPac Area: CO-WY District - Temporarily Closed - Wetmore Post Office (81253)
Data Files
07/02/2026
Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q3 FY26)

ACS Nixie stats by industry for FY26 Q3.

Announcements
07/02/2026
INFORMATIONAL: Commercial System Releases - July 11 – July 17
Release Notes
07/02/2026
July 12 2026 Release Notes
Contact Lists
07/02/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
07/02/2026
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
07/02/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)