Data Files
11/02/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
11/02/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
11/02/2026
Area District Finance File (AREADIST.TXT)
Data Files
11/02/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
11/02/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Data Files
10/29/2026
Z4 Info File

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

Data Files
10/29/2026
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.

 

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.

  • 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
    10/23/2026
    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 the current fiscal year.

     

    *Please note, Postal Pro is the only source for a current IV-MTR Development log as updates will be made on an ongoing basis.