Data Files
08/27/2026
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
08/26/2026
DELIVERY: WestPac Area – NV-UT District - Sierra Post Office (89506) – Resume Operations
Release Notes
08/26/2026
August 27, 2026 COP Release Notes
Announcements
08/25/2026
DELIVERY: WestPac Area – CO-WY District - Hasty Post Office (81044) – Resume Operations
Announcements
08/25/2026
INFORMATIONAL: USPS Scan Event Extract Modernization Updates
Presentations
08/25/2026
PCCAC: News You Need to Know from MTAC - July 2026
Announcements
08/25/2026
PROCESSING AND DISTRIBUTION - Update - Southeast Region – Tennessee – Severe Weather Impacts
Announcements
08/25/2026
INFORMATIONAL - Commercial System Releases – August 27, 2026 – September 4, 2026
User Guides
08/25/2026
Intelligent Mail Small Business (IMsb) Tool User Guide
Contact Lists
08/25/2026
USPS® Approved Manufacturers of Mailing Containers for Adult Birds

A list of contact information for adult bird container manufacturers that have been certified by USPS.

Announcements
08/24/2026
DELIVERY - Sierra Post Office (89506) - Temporarily Closed
Announcements
08/24/2026
INFORMATIONAL - Elevate Your Marketing Strategy with USPS 2027 Mailing Promotions Kickoff Webinar
Announcements
08/24/2026
INFORMATIONAL - National Change of Address (NCOA+) APIs through October 19, 2026
Presentations
08/24/2026
FY 2026 PS Form 3548 Review and Verification of Circulation
Data Files
08/24/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
08/24/2026
City/State ZIP Code Weekly Compare
Data Files
08/24/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
08/24/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
08/24/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
08/24/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Data Files
08/24/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
08/24/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
08/24/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
08/24/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
08/24/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)