Release Notes
07/08/2026
USPS APIs Release Notes

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

Announcements
06/24/2026
INFORMATIONAL - Enterprise Payment System (EPS) – INCIDENT #10784524 Processing Postage Statement Error
Publications
06/24/2026
MGI Credit Claim Request Deck
Data Files
06/24/2026
Updated List: Service Type Codes for Intelligent Mail® Package Barcode (IMpb)

This document provides the updated service type codes for  Intelligent Mail® Package Barcodes.

Announcements
06/23/2026
INFORMATIONAL - Domestic HAZMAT Handling and Noncompliance Fees
Announcements
06/23/2026
DELIVERY - WestPac Area - California 1 District - Santa Rosa Annex Post Office (95407) - Relocation
Presentations
06/23/2026
Pop-Up Mini-Cafe: Site Synergy: WestPac PCCs Lead the Way Mini Café
Release Notes
06/23/2026
July 2026 Release Notes
Presentations
06/23/2026
MGI Credit Claim Request – Transferring credits to MSP
Presentations
06/23/2026
MGI Credit Claim Request Video
FAQs
06/23/2026
Mail Growth Incentives FAQs
Release Notes
06/23/2026
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.

Announcements
06/22/2026
INFORMATIONAL - Updates To: USPS Modernization Through Package Equipment Upgrades In June 2026
Data Files
06/22/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
06/22/2026
City/State ZIP Code Weekly Compare
Data Files
06/22/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
06/22/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
06/22/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
06/22/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
06/22/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
06/22/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
06/22/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
06/22/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
06/22/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
06/22/2026
Area District Finance File (AREADIST.TXT)
Data Files
06/22/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
06/22/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Release Notes
06/18/2026
PTR2 Release Notes_DD_06_22_26
Announcements
06/18/2026
INFORMATIONAL - Commercial System Releases July 1, 2026
Program Requirements
06/18/2026
2027 PCC Premier Certificate Program Guide
Program Requirements
06/18/2026
2027 Bronze Level Requirements
Program Requirements
06/18/2026
2027 Silver Level Requirements
Program Requirements
06/18/2026
2027 Gold Level Requirements
Program Requirements
06/18/2026
2027 PCC Leadership Award Program Guide
Applications/ Forms
06/18/2026
2027 PCC Leadership Award Nomination Form
Contact Lists
06/18/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
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
06/18/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
Contact Lists
06/18/2026
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)