Data Files
04/02/2026
Z4 Info File

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

Data Files
04/02/2026
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
04/01/2026
INFORMATIONAL - USPS Modernization Through Package Equipment Upgrades in April 2026
Announcements
04/01/2026
INFORMATIONAL - Atlantic Area AIM Meeting June 2, 2026
Data Files
04/01/2026
March 2026 Nixie Volume

This spreadsheet contains the UAA statistics for March 2026.

Announcements
04/01/2026
INFORMATIONAL - Federal Register - Manifest Mailing System Retired April 1, 2026
Data Files
04/01/2026
Informed Visibility Mail Tracking & Reporting Machine Count

List of US Postal Service machines by site, including a description of each machine.

Data Files
04/01/2026
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.

Release Notes
04/01/2026
USPS APIs Release Notes

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

Data Files
04/01/2026
ZIP Codes by Area and District codes

The Excel spreadsheet lists ZIP Codes with the associated Area and District Codes.