Data Files
02/17/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
02/17/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
02/17/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
02/17/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
02/17/2026
Area District Finance File (AREADIST.TXT)
Data Files
02/17/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
02/17/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Data Files
02/13/2026
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
02/09/2026
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
02/06/2026
Informed Visibility Mail Tracking & Reporting Machine Count

List of US Postal Service machines by site, including a description of each machine.