INFORMATIONAL: USPS APIs System Release Notification - Ship 30.0.1.0 Release

INFORMATIONAL - November 9-13 Recommendations for Live Animal Shipping

INFORMATIONAL - RESOLVED - PostalOne! System – INCIDENT 11152094

PTR1 Maintenance Notes_DD_10_31_26

Labeling List Changes Effective December 1, 2026

Effective December 1, 2026, the Postal Service™ will revise Labeling List(s) L001, L004, L009, L010, L012, L015, L016, L201, L602, L605, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the December 1, 2026, effective date through January 31, 2027, expiration date. The changes will be published in the Postal Bulletin, Issue #22715.
 

***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)

City/State ZIP Code Weekly Compare

3 Digit ZIP/AISU Office List (AISUREPT.TXT)

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Operation Codes List

This spreadsheet provides a list of operation codes (opcodes), also known as Scan Event Codes, for the IV-MTR application.

AIS Congressional District File (CONG_DIST.TXT)

AIS County Name Table Layout (AISCNTY.TXT)

AMS County Name Table (COUNTY_NAME_TABLE.TXT)

AMS Address Report: AISU Mailing List (ADDRREPT.TXT)

AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)

AISU ZIP Code File (AISUZIPS.TXT)

AISU Contact Information (AISUADDR.TXT)

Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)

Area District Finance File (AREADIST.TXT)

Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)

Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Delivery - Hughesville Post Office (20637) - Resumes Operations

INFORMATIONAL - Scheduled Maintenance for November 14, 2026 – Possible Disruption with USPS Payments API

USPS Fuel Surcharge Implementation-Frequently Asked Questions

The USPS is creating a Fuel Surcharge, which will be charged on all competitively priced packages and calculated as a percentage of the base postage.  The surcharge will be updated weekly, based on the prices of diesel and jet fuel, as described on the eia.gov website.

Informed Delivery API Release Notes V1.0.3

Informed Delivery API Technical Specifications V1.0_5.1