Data Files
10/27/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
10/27/2026
City/State ZIP Code Weekly Compare
Data Files
10/27/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
10/27/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
10/27/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
10/27/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)
Contact Lists
10/27/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
10/27/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
10/27/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
10/27/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
10/27/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
10/27/2026
Area District Finance File (AREADIST.TXT)
Data Files
10/27/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
10/27/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
10/26/2026
Delivery - Hughesville Post Office (20637) - Resumes Operations
Announcements
10/26/2026
INFORMATIONAL - Scheduled Maintenance for November 14, 2026 – Possible Disruption with USPS Payments API
Release Notes
10/24/2026
Informed Delivery API Release Notes V1.0.3
Technical Specifications
10/24/2026
Informed Delivery API Technical Specifications V1.0_5.1
Announcements
10/23/2026
INFORMATIONAL - USPS APIs System Release Notification - REVISED
Announcements
10/23/2026
INFORMATIONAL - Oracle PSU Patching - PPI, PASS, MANIF, GEO, and ADP
Announcements
10/23/2026
INFORMATIONAL - Commercial System Releases – October 28, 2026 and November 1, 2026
Announcements
10/23/2026
INFORMATIONAL - PostalOne! Alert – October 25, 2026
Announcements
10/23/2026
INFORMATIONAL - Informed Delivery Mailer Campaign Portal (MCP) Scheduled Outage on October 24
Announcements
10/23/2026
INFORMATIONAL - Postal One System Promotions Not Applied to Postal Wizard Statements
Release Notes
10/23/2026
November 1 2026 Program Registration 31.4.0.0 Pre-Release Notes