Release Notes
04/09/2026
Quick Service Guides
04/07/2026
Enterprise Payment System (EPS) Deposit Instructions

These instructions include general technical information and instructions for sending electronic funds into your EPS account. The information here is designed for trust customers (and debit customers who need to initiate a fund transfer to cover a debit return problem).

Data Files
04/07/2026
Informed Delivery® Post-Campaign (IDPC) Data through IV-MTR® Data Dictionary

This document describes the Informed Delivery Post-Campaign (IDPC) data fields available through the IV-MTR application.

FAQs
04/06/2026
Release Notes
04/03/2026
Release Notes
04/03/2026
Publications
04/02/2026
  • 04/02/2026
  • 04/01/2026

    March 2026 Nixie Volume

    This spreadsheet contains the UAA statistics for March 2026.

  • Data Files
    04/01/2026
    Informed Visibility Mail Tracking & Reporting Machine Count

    List of US Postal Service machines by site, including a description of each machine.

    User Guides
    03/30/2026
    USPS APIs Terms and Conditions

    ACKNOWLEDGEMENT AND ACCEPTANCE. Read this carefully before registering to use the USPS API services. By utilizing the APIs, you hereby ACCEPT ALL of the terms and conditions of this Agreement. 

    Release Notes
    03/29/2026
    Release Notes
    03/27/2026
    Release Notes
    03/27/2026
  • 03/27/2026

    Labeling List Changes Effective May 1, 2026

    Effective May 1, 2026, the Postal Service™ will revise Labeling List(s) L007, L012, L014, L016, L051, L201, 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 May 1, 2026, effective date through June 30, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22700.

  • Announcements
    03/26/2026
    Announcements
    03/25/2026
    Beyond the Mail

    Turn USPS’s unmatched doorstep reach into smarter decisions with Beyond the Mail—powered by USPS Post Office and Collection Box Data, USPS Occupancy Trends, and USPS Population Mobility Trends for sharper planning across real estate, retail, logistics, and more.

    Release Notes
    03/25/2026
    User Guides
    03/24/2026
    Tracking Access Control Tech Sheet

    Package Tracking allows seamless integration of real-time tracking information into business systems, enabling monitoring of USPS package status from shipment to delivery.  USPS is upgrading tracking data access to enhance security and combat fraud by modernizing and securing customer access.