Announcements
05/26/2026
PROCESSING AND DISTRIBUTION - Western Region – Tucson, AZ P&DC - Power Outage
Data Files
05/26/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
05/26/2026
City/State ZIP Code Weekly Compare
Contact Lists
05/26/2026
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

 

Data Files
05/26/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
05/26/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
05/26/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
05/26/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
05/26/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
05/26/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
05/26/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
05/26/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
05/26/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
05/26/2026
Area District Finance File (AREADIST.TXT)
Data Files
05/26/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
05/26/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
05/23/2026
PROCESSING & DISTRIBUTION: Tampa, FL Regional Processing & Distribution Center (RPDC) Modernizes Operations on May 25, 2026
Announcements
05/22/2026
INFORMATIONAL - Commercial System Releases (May 30 – June 5) May 31, 2026
Release Notes
05/21/2026
PTR2 Release Notes_DD_05_21_26
Technical Specifications
05/21/2026
PTR Tracking API Specifications and Integration
Contact Lists
05/21/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
05/21/2026
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
05/21/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
05/21/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)
Contact Lists
05/21/2026
CASS™ Certified Products Guide: M L O C R Service Bureaus Data File Cycle O - (Expires July 31, 2028)