Announcements
04/06/2026
INFORMATIONAL - Executive Retirement - Sharon Owens
FAQs
04/06/2026
USPS PTR2 API Known Issues
Data Files
04/06/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
04/06/2026
City/State ZIP Code Weekly Compare
Data Files
04/06/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
04/06/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
04/06/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
04/06/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Data Files
04/06/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
04/06/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
04/06/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
04/06/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
04/06/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
04/06/2026
Area District Finance File (AREADIST.TXT)
Data Files
04/06/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
04/06/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
04/03/2026
DELIVERY - WestPac Area - ID-MT-OR District - Office Temporarily Closed - North Bend Post Office
Announcements
04/03/2026
INFORMATIONAL - USPS APIs System Deployment April 18, 2026
Announcements
04/03/2026
INFORMATIONAL - USPS APIs System Deployment April 12, 2026
Release Notes
04/03/2026
PTR2 Release Notes_DD_04_02_26
Release Notes
04/03/2026
PTR2 Release Notes_DD_04_04_26
Error Codes
04/03/2026
Known Issues List 4.3.2026
Release Notes
04/03/2026
USPS APIs Release Notes

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

Announcements
04/02/2026
DELIVERY - Southern Area - Texas 3 District - Los Jardines Post Office (78237) - Temporarily Suspended
Announcements
04/02/2026
INFORMATIONAL -Upcoming USPS.com Maintenance CANCELLED
Announcements
04/02/2026
DELIVERY Resumption of Mail Service to Lebanon- Effective April 3, 2026
Publications
04/02/2026
PCC Events (April 2026)
Data Files
04/02/2026
Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q2 FY26)

ACS Nixie stats by industry for FY26 Q2.

Publications
04/02/2026
Destination Entry Service Standard Directory
Publications
04/02/2026
Combined Service Standard Directory-PRI
Publications
04/02/2026
Supplemental Service Standard Directory-PRI
Publications
04/02/2026
Supplemental Service Standard Directory-PKG
Publications
04/02/2026
Supplemental Service Standard Directory-PFC
Publications
04/02/2026
Supplemental Service Standard Directory-PER
Publications
04/02/2026
Supplemental Service Standard Directory-MKT
Publications
04/02/2026
Supplemental Service Standard Directory-GAL
Publications
04/02/2026
Supplemental Service Standard Directory-GAH
Publications
04/02/2026
Supplemental Service Standard Directory-FCM
Publications
04/02/2026
Combined Service Standard Directory-GAL
Publications
04/02/2026
Combined Service Standard Directory-PKG
Publications
04/02/2026
Combined Service Standard Directory-PFC
Publications
04/02/2026
Combined Service Standard Directory-PER
Publications
04/02/2026
Combined Service Standard Directory-MKT
Publications
04/02/2026
Combined Service Standard Directory-GAH
Publications
04/02/2026
Combined Service Standard Directory-FCM
Publications
04/02/2026
3D Base Service Standard Directory
Contact Lists
04/02/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)
Contact Lists
04/02/2026
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
04/02/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Data File Cycle O - (Expires July 31, 2028)
Contact Lists
04/02/2026
CASS™ Certified Products Guide: M L O C R Mailers/Users Cycle O - (Expires July 31, 2028)