DELIVERY - INTERNATIONAL SERVICE SUSPENSION NOTICE – effective July 17, 2026

INFORMATIONAL - Security Enhancements to USPS.com July 30, 2026

INFORMATIONAL - UPDATE - PostalOne! System (PO!) – Delivery Sort Container Discount Not Applied

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Release Notes

These release notes summarize new features and enhancements implemented in deployments to the IV-MTR application.

MPE (Mail Processing Equipment) Service Provider Licensees

Marketing contact information for certified Mail Processing Equipment (MPE) licensees 

PCC Voice Challenge #BestMailbox Contest!

INFORMATIONAL - FAST Appointments Pilot for Packages Entered or Accepted at S&DCs

INFORMATIONAL - REMINDER - POSTPONED – Addresses API 3.2.3 Access Postponed Until August 1, 2026

Addresses API - Tech Sheet

Catalog Incentive Fact Sheet

Catalogs offer a unique marketing perspective to products and services and provide important value to the mailbox. As part of the July 14, 2024 price change, USPS published a new Catalog definition in the Domestic Mail Manual. Simultaneously, the Postal Service is offering a Catalog Incentive price discount of $0.001 per mailpiece to Catalog mailers who comply with the new Catalog definition and meet all other eligibility requirements for the Catalog Incentive.

Catalog Incentive FAQ's

Marriage Mail Incentive FAQs

Marriage Mail is a form of direct mail in which marketing service companies combine or “marry” advertisements (e.g., coupons or sales notices) from multiple companies into one mail piece to reduce the cost of the mailing for individual advertisers. This type of direct mailing product allows businesses to reach targeted customer segments.

INFORMATIONAL - Updated PostalOne! System (PO!) – Delivery Sort Container Discount not applied

USPS APIs Access Control Data Dictionary

Detailed information on the USPS APIs data elements available through the Informed Visibility Mail Tracking & Reporting (IV-MTR) application for API Access Control.

INFORMATIONAL - PostalOne! System (PO!) – Delivery Sort Container Discount not applied

Marriage Mail Incentive Fact Sheet

Marriage Mail is a form of direct mail in which marketing service companies combine or “marry” advertisements (e.g., coupons or sales notices) from multiple companies into one mail piece to reduce the cost of the mailing for individual advertisers. The Marriage Mail Incentive is a discounted (incentive) price offered on Saturation (including EDDM-Commercial) and High Density Plus Marketing Mail letters and flats which meet certain requirements including weight and advertiser content. It has been developed in response to market needs and will benefit the mailing industry, small businesses, consumers and the USPS. As of July 12, 2026, the Incentive price will be a 20% discount on qualifying pieces.

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

99% Mailer Move Update Process Order Form

This form is required to be completed for the 99% accurate certification testing process.

USPS Ship Data Dictionary

Detailed information on the USPS Ship (Formerly Package Platform) data elements available through the Informed Visibility Mail Tracking & Reporting (IV-MTR) application. Please note that items in bold text were updated or added recently.

City/State ZIP Code Weekly Compare

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

Cumulative Listing of ZIP Codes Covered by the LACS Database

This document provides a cumulative listing of ZIP Codes covered by the LACS database for LACS^Link®.

AIS Congressional District File (CONG_DIST.TXT)

AIS County Name Table Layout (AISCNTY.TXT)

AMS County Name Table (COUNTY_NAME_TABLE.TXT)