Data Files
01/15/2026
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

 

Announcements
01/14/2026
Postmaster General David Steiner’s Invitation to the National Postal Forum 2026
Announcements
01/14/2026
INFORMATIONAL - USPS APIs System Maintenance January 28, 2026
Release Notes
01/14/2026
USPS APIs Release Notes

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

Announcements
01/13/2026
INFORMATIONAL - Extended Customer Webinars on Upcoming USPS Tracking Data Access Controls
Announcements
01/13/2026
INFORMATIONAL - July Price Change 2026 -Release Overview
Announcements
01/12/2026
DELIVERY: WestPac Area – Washington District – Stehekin Post Office – Resume Operations.
Announcements
01/12/2026
DELIVERY - Elba Post Office (14058) – Suspended Temporarily
User Guides
01/12/2026
Tracking Access Control Tech Sheet

Package Tracking allows seamless integration of real-time tracking information into business systems, enabling monitoring of USPS package status from shipment to delivery.  USPS is upgrading tracking data access to enhance security and combat fraud by modernizing and securing customer access.

Announcements
01/12/2026
INFORMATIONAL - USPS Returns Package Quality Noncompliance Assessments