Data Files
06/29/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
06/29/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
06/29/2026
Area District Finance File (AREADIST.TXT)
Data Files
06/29/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
06/29/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Data Files
06/25/2026
Z4 Info File

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

Data Files
06/25/2026
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
06/24/2026
Updated List: Service Type Codes for Intelligent Mail® Package Barcode (IMpb)

This document provides the updated service type codes for  Intelligent Mail® Package Barcodes.

Data Files
06/08/2026
Cumulative Listing of ZIP Codes Covered by the LACS Database

This document provides a cumulative listing of ZIP Codes covered by the LACS database for LACSLink®.

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.