Error Codes
10/28/2026
Known Issues List 10.27.2026
Presentations
10/28/2026
USPS Ship Disputes and Refunds: Joint Review
FAQs
10/28/2026
USPS Ship Frequently Asked Questions

USPS Ship Frequently Asked Questions

Data Files
10/28/2026
Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Operation Codes List

This spreadsheet provides a list of operation codes (opcodes), also known as Scan Event Codes, for the IV-MTR application.

Announcements
10/27/2026
INFORMATIONAL: USPS APIs System Release Notification - Ship 30.0.1.0 Release
Announcements
10/27/2026
INFORMATIONAL - November 9-13 Recommendations for Live Animal Shipping
Announcements
10/27/2026
INFORMATIONAL - RESOLVED - PostalOne! System – INCIDENT 11152094
Release Notes
10/27/2026
PTR1 Maintenance Notes_DD_10_31_26
Data Files
10/27/2026
Labeling List Changes Effective December 1, 2026

Effective December 1, 2026, the Postal Service™ will revise Labeling List(s) L001, L004, L009, L010, L012, L015, L016, L201, L602, L605, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the December 1, 2026, effective date through January 31, 2027, expiration date. The changes will be published in the Postal Bulletin, Issue #22715.
 

Data Files
10/27/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)