Presentations
07/03/2025
Catalog Insights Webinar
Announcements
07/03/2025
INFORMATIONAL: USPS Transitions from an On-prem Environment to a Cloud-based Platform
Release Notes
07/03/2025
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

Data Files
07/03/2025
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File

Data Files
07/03/2025
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

 

Release Notes
07/02/2025
Catalog Insights Promotion Webinar - Slides

See the slideshow below from the Catalog Insights Promotion webinar. Note that minor updates have been made to the slides, including updating language surrounding Bound Printed Matter and an additional slide on how to qualify for the Promotion. 

Announcements
07/02/2025
Post Office/ZIP Code Entries for Postal Bulletin 7/10/2025

This spreadsheet provides details on the Post Office/ZIP Code entry changes for Postal Bulletin issue 7/10/2025.

Announcements
07/02/2025
DELIVERY: International Service Resumption Notice - Effective July 4, 2025
Data Files
07/02/2025
Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q3 FY25)

ACS Nixie stats by industry for FY25 Q3.

Fact Sheets
07/02/2025
Address Matching System API (AMS API) Licensing Fees

This document outlines the AMS API prorated fee structure. License fees are prorated for the initial license year with a license year beginning October 1 and ending September 30.