Announcements
04/20/2026
INFORMATIONAL - USPS APIs System Notification April 23, 2026
Announcements
04/20/2026
INFORMATIONAL - Last Chance - Register Today for the 2026 National Postal Forum
Announcements
04/20/2026
INFORMATIONAL - Expansion of Daily Webinar Series – API Package Tracking Access Control, Address & NCOA APIs through July 24, 2026
Data Files
04/20/2026
Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Development Tracker

This document provides a list of active IV-MTR work to be as well as items completed in FY25.

 

*Please note, Postal Pro is the only source for a current IV-MTR Development log as updates will be made on an ongoing basis.

Data Files
04/20/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
04/20/2026
City/State ZIP Code Weekly Compare
Data Files
04/20/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
04/20/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
04/20/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
04/20/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
04/20/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
04/20/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
04/20/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
04/20/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
04/20/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
04/20/2026
Area District Finance File (AREADIST.TXT)
Data Files
04/20/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
04/20/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
04/17/2026
INFORMATIONAL: PostalOne! – [INCIDENT # 10576848] Error for Mail Entry Invoice Transaction Requests
Announcements
04/17/2026
INFORMATIONAL - Officer Announcement - Pete Routsolias
Release Notes
04/17/2026
April 26 2026 Release Notes
Announcements
04/17/2026
INFORMATIONAL - Connect with USPS Experts at the 2026 National Postal Forum Consultation Center
Announcements
04/17/2026
INFORMATIONAL - Executive Retirement - Dr. Joshua D. Colin
Announcements
04/17/2026
INFORMATIONAL - Forge Bold Horizons at NPF 2026 Peer-to-Peer Session
Announcements
04/17/2026
INFORMATIONAL - REMINDER - July 2026 Market Dominant Price Change Filing Webinar - TODAY - Friday, April 17, 2026
Release Notes
04/17/2026
PTR2 Release Notes_DD_04_18_26
Release Notes
04/17/2026
Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

Presentations
04/16/2026
PCCAC: News You Need to Know From MTAC- April 2026

 

https://usps.zoomgov.com/rec/share/014XiJDyDB506s5L-7ImZuCR29adj-qAaJXZ97ibJO4-TYaPEB23pwpAZ1VeV_wd.mUNSVb1hvupvCRGb

Passcode: sL@=.d6c

Announcements
04/16/2026
DELIVERY -International Service Resumption of Mail Service to Qatar - Effective April 17, 2026
Announcements
04/16/2026
DELIVERY - West Meridian Post Office (39307) - Suspended Temporarily
Error Codes
04/16/2026
Known Issues List 4.14.2026
Release Notes
04/16/2026
USPS APIs Release Notes

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

Contact Lists
04/16/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
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
04/16/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/16/2026
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
Contact Lists
04/16/2026
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
04/16/2026
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
Contact Lists
04/16/2026
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)