Announcements
07/30/2026
INFORMATIONAL - Electronic Verification System (eVS) Retirement
Announcements
07/30/2026
INFORMATIONAL - Security Enhancements to USPS.com
Data Files
07/30/2026
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File

Data Files
07/30/2026
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
07/29/2026
DELIVERY - WestPac Area - ID-MT-OR District - Antelope Post Office – Resume Operations
Announcements
07/29/2026
DELIVERY - WestPac Area - ID-MT-OR District - Paulina Post Office – Resume Operations
Announcements
07/29/2026
INFORMATIONAL - Discontinuance of USPS Tracking Labels
Release Notes
07/29/2026
USPS APIs Release Notes

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

Announcements
07/28/2026
DELIVERY - White Swan Post Office (98952) - Closed
Announcements
07/28/2026
INFORMATIONAL - Upcoming USPS.com outage on August 22, 2026