Data Files
06/22/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
06/22/2026
City/State ZIP Code Weekly Compare
Data Files
06/22/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
06/22/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
06/22/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
06/22/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
06/22/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
06/22/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
06/22/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
06/22/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
06/22/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
06/22/2026
Area District Finance File (AREADIST.TXT)
Data Files
06/22/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
06/22/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Release Notes
06/18/2026
PTR2 Release Notes_DD_06_22_26
Announcements
06/18/2026
INFORMATIONAL - Commercial System Releases July 1, 2026
Program Requirements
06/18/2026
2027 PCC Premier Certificate Program Guide
Program Requirements
06/18/2026
2027 Bronze Level Requirements
Program Requirements
06/18/2026
2027 Silver Level Requirements
Program Requirements
06/18/2026
2027 Gold Level Requirements
Program Requirements
06/18/2026
2027 PCC Leadership Award Program Guide
Applications/ Forms
06/18/2026
2027 PCC Leadership Award Nomination Form
Release Notes
06/18/2026
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

Contact Lists
06/18/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
06/18/2026
RDI™ Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)

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