Data Files
10/05/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
10/05/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
10/05/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
10/05/2026
Area District Finance File (AREADIST.TXT)
Data Files
10/05/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
10/05/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Release Notes
10/04/2026
October 4 2026 - PO! and ProgReg - Release Notes
Announcements
10/02/2026
PROCESSING AND DISTRIBUTION - Chicago, IL Regional (RPDC) - Power Outage
User Guides
10/02/2026
API Access Control Customer Dispute Instructions
Announcements
10/02/2026
INFORMATIONAL - UPDATE: PostalOne! Alert – October 4, 2026