Presentations
07/03/2025
07/03/2025
Announcements
07/03/2025
07/03/2025
Release Notes
07/03/2025
07/03/2025
USPS APIs Release Notes
For the latest updates, please review the USPS APIs Release Notes.
Data Files
07/03/2025
07/03/2025
Z4 Info File
A downloadable ZIP file containing information related to the Z4 Info File
Data Files
07/03/2025
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
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
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
07/02/2025
Data Files
07/02/2025
07/02/2025
Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q3 FY25)
ACS Nixie stats by industry for FY25 Q3.