Contact Lists
08/11/2026
Mail Service Provider (MSP) - Full-Service Certified Mailers

A Mail Service Provider (MSP) offers a variety of solutions to prepare and present Full-Service presort mailings. For more information regarding Certified MSPs, please follow this link: https://postalpro.usps.com/full-service-cert/fact-sheet

 

FAQs
08/10/2026
Modernization of Address Processing with APIs - Q & A
Fact Sheets
08/10/2026
USPS Addresses API - Completing PS Form 3553
Announcements
08/10/2026
INFORMATIONAL - Commercial System Releases – Week of August 15, 2026
Announcements
08/10/2026
INFORMATIONAL - PostalOne! Release – August 16, 2026
Release Notes
08/10/2026
August 9, 2026 Program Registration R31.1.0.0 Release Notes
Release Notes
08/10/2026
August 9, 2026 eSAS R47.2.0.0 Release Notes
Release Notes
08/10/2026
August 16, 2026 PostalOne! and USPS Ship Release
Data Files
08/10/2026
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.

Data Files
08/10/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
08/10/2026
City/State ZIP Code Weekly Compare
Data Files
08/10/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
08/10/2026
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
08/10/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
08/10/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
08/10/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
08/10/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
08/10/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
08/10/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
08/10/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
08/10/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
08/10/2026
Area District Finance File (AREADIST.TXT)
Data Files
08/10/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
08/10/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
08/07/2026
INFORMATIONAL - USPS APIs System Deployment [CR# TBD] - August 22, 2026