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User Guides
10/14/2026

eDoc Submitter Credit Enrollment GuIde

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10/14/2026

2027 Promotions Webinar Recording

NOTE: THE WEBINAR BEGINS AT THE 18:40 MARK

Recording of the 2027 Promotions Webinar going over details of the various promotions and add-ons.
10/14/2026

2027 Promotions Webinar Slides

Slides for the 2027 Promotions Webinar providing details on the various promotions offered.

Release Notes
10/14/2026

EU Customs Change Release Overview

Technical Specifications
10/14/2026

USPS MCAT - TechSheet

Announcements
10/13/2026

PROCESSING & DISTRIBUTION: Update - Hurricane Isaias - Gulf Region of U.S. - Processing Facilities Resume Operations

Announcements
10/13/2026

DELIVERY: Update - Southern Area - Florida 1 - 3 Digit Zip Code Areas - 324 & 325 Operations Restored

Release Notes
10/13/2026

October 11 2026 EPS 8.7.2.0 Release Notes

Error Codes
10/13/2026

Known Issues List 10.08.2026

Data Files
10/13/2026

Updated - New Areas - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)

Data Files
10/13/2026

City/State ZIP Code Weekly Compare

Data Files
10/13/2026

3 Digit ZIP/AISU Office List (AISUREPT.TXT)

Data Files
10/13/2026

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 LACS^Link®.

Data Files
10/13/2026

AIS Congressional District File (CONG_DIST.TXT)

Data Files
10/13/2026

AIS County Name Table Layout (AISCNTY.TXT)

Data Files
10/13/2026

AMS County Name Table (COUNTY_NAME_TABLE.TXT)

Contact Lists
10/13/2026

AMS Address Report: AISU Mailing List (ADDRREPT.TXT)

Data Files
10/13/2026

AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)

Data Files
10/13/2026

AISU ZIP Code File (AISUZIPS.TXT)

Data Files
10/13/2026

AISU Contact Information (AISUADDR.TXT)

Data Files
10/13/2026

Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)

Data Files
10/13/2026

Area District Finance File (AREADIST.TXT)

Data Files
10/13/2026

Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)

Data Files
10/13/2026

Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
10/11/2026

DELIVERY: Southern Area - AL-MS District - Coffee Springs Post Office (36318) - Temporarily Suspended

Announcements
10/11/2026

DELIVERY: Southern Area - AL/MS Resume Operations - 3-Digit Zip Code Areas - 365, 366 & 395

Announcements
10/11/2026

DELIVERY: Southern Area - Florida 1: 3 Digit Zip Code Areas - Temporarily Suspended

Announcements
10/10/2026

PROCESSING & DISTRIBUTION: Update - Hurricane Isaias - Gulf Region of U.S. - Facility Closures

Announcements
10/09/2026

PROCESSING & DISTRIBUTION: Update Central Processing Region - Louisville, KY Processing and Distribution Center (P&DC) Delays

Announcements
10/09/2026

DELIVERY - Southern Area -AL-MS District - 3-Digit Zip Code Areas 365, 366, & 395 Temporarily Suspended

Announcements
10/09/2026

INFORMATIONAL - Commercial System Releases (COP 2.5.9, LBRO 20.0.93)

Announcements
10/09/2026

INFORMATIONAL - Hurricane Isaias – Gulf Region of U.S. – Facility Closures

Announcements
10/09/2026

INFORMATIONAL - PO! Alert - October 18, 2026

Release Notes
10/09/2026

October 18 2026 PO! 64.1.2.0 Release Notes

Release Notes
10/09/2026

October 15 2026 COP 2.5.9 Release Notes

Release Notes
10/09/2026

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

Announcements
10/08/2026

DELIVERY - Crucible Post Office (15325) - Suspended Temporarily

Announcements
10/08/2026

INFORMATIONAL - Scheduled Maintenance for October 17, 2026 – Possible Disruption with USPS Payments API

Contact Lists
10/08/2026

CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

This document outlines the CASS/MASS certified vendors list for RDI™ Cycle O.

Contact Lists
10/08/2026

CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: M L O C R Service Bureaus Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: M L O C R Hardware Manufacturers Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: Z4CHANGE Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: Z4CHANGE Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)

Contact Lists
10/08/2026

CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)

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