Data Files
05/01/2026
April 2026 Nixie Volume

This spreadsheet contains the UAA statistics for April 2026.

Data Files
05/01/2026
ZIP Codes by Area and District codes

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

Data Files
04/30/2026
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.

Data Files
04/30/2026
Z4 Info File

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

Data Files
04/30/2026
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.