Data Files
05/11/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
05/11/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
05/11/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
05/11/2026
Area District Finance File (AREADIST.TXT)
Data Files
05/11/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
05/11/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
05/08/2026
INFORMATIONAL: Commercial System Releases - May 16th - 22nd
Release Notes
05/08/2026
May 17 2026 PostalOne! R63.2.2.0 Release Notes
Release Notes
05/08/2026
May 17 2026 USPS Ship R27.0.0.0 Release Notes
Contact Lists
05/07/2026
CASS™ Certified Products Guide: Residential Delivery Indicator Cycle O - (Expires July 31, 2028)