Data Files
06/29/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
06/28/2026
INFORMATIONAL - JULY PRICE CHANGE 2026 - Commercial System Releases - 06/28/26
Release Notes
06/28/2026
July 2026 Release Notes
Release Notes
06/27/2026
PTR2 Release Notes_DD_06_27_26
Announcements
06/26/2026
DELIVERY: Southern Area -Louisiana District - Dupont Post Office (71329) - Temporarily Suspended
Announcements
06/26/2026
PROCESSING AND DISTRIBUTION: Louisville, KY - Region Modernization
Announcements
06/26/2026
PROCESSING & DISTRIBUTION: USPS Launches Three Regional Processing & Distribution Centers (RPDCs) on June 29, 2026
Release Notes
06/26/2026
USPS APIs Release Notes

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

Error Codes
06/25/2026
Known Issues List 6.25.2026
Contact Lists
06/25/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)