Data Files
11/12/2026
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
11/10/2026
New National Industry AIM Co-Chair – Alexis Nicoletta
Announcements
11/10/2026
INFORMATIONAL - UPDATE - Discontinuance of USPS Tracking Labels (888, 889, 891, 892)
Announcements
11/10/2026
INFORMATIONAL - New National Industry AIM Co-Chair - Alexis Nicoletta
Announcements
11/10/2026
INFORMATIONAL - Zoom Technical Difficulty - FY2027 Peak Season Network Update Webinars Begin Nov 12
Release Notes
11/10/2026
PTR2 Release Notes_DD_11_14_26
Release Notes
11/10/2026
PFSC Application 3.0 Release Notes 11-10-2026

PFSC Release Notes for the enhancement release on 11/10/2026.

Release Notes
11/10/2026
November 12 2026 COP 2.5.9 Release Notes
User Guides
11/10/2026
Premium Forwarding Service Commercial External User Guide

User Guide for the Premium Forwarding Service Commercial application. 

Fact Sheets
11/10/2026
Mailer Identifier (MID) Exception Process

The Postal Service will issue a Mailer Identifier (MID) to a mailer for use in the Intelligent Mail® container barcode, Intelligent Mail® tray barcode, Intelligent Mail® barcode or Intelligent Mail® package barcode. The MID is a field within the Intelligent Mail barcodes and is used to identify the mailer.

Announcements
11/09/2026
INFORMATIONAL - REMINDER - FY2027 Peak Season Network Update Webinars Begin
Announcements
11/09/2026
News You Need to Know from MTAC - October 2026
Data Files
11/09/2026
Informed Visibility Mail Tracking & Reporting Machine Count

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

Data Files
11/09/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
11/09/2026
City/State ZIP Code Weekly Compare
Data Files
11/09/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
11/09/2026
Cumulative Listing of ZIP Codes Covered by the LACS Database

This document provides a cumulative listing of ZIP Codes covered by the LACS database for LACSLink®.

Data Files
11/09/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
11/09/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
11/09/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
11/09/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
11/09/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
11/09/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
11/09/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
11/09/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)