Data Files
06/04/2026
Z4 Info File

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

Data Files
06/04/2026
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.

 

Announcements
06/03/2026
INFORMATIONAL - USPS Modernization Through Package Equipment Upgrades in June 2026
Announcements
06/03/2026
DELIVERY - Corte Madera Post Office - Temporarily Closed
Publications
06/03/2026
PCC Events (June 2026)
Fact Sheets
06/03/2026
IMpb/IMmb Electronic File Transmission Requirements
Announcements
06/02/2026
INFORMATIONAL - RESOLVED - Enterprise Payment System – Incident #10716992 Issues with Postage Statement Finalization, ACH Withdrawal Details Missing from Data Feeds
Error Codes
06/02/2026
Known Issues List 6.2.2026
Applications/ Forms
06/02/2026
Occupancy Trends License Agreement
Data Files
06/02/2026
ZIP Codes by Area and District codes

The Excel spreadsheet lists ZIP Codes with the associated Area and District Codes.