Data Files
03/12/2026
Z4 Info File

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

Data Files
03/12/2026
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.

 

Data Files
03/09/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
03/09/2026
City/State ZIP Code Weekly Compare
Data Files
03/09/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)