Announcements
04/13/2026
INFORMATIONAL - 2026 National Postal Forum Leadership Insight Sessions
Announcements
04/13/2026
INFORMATIONAL - Package Tracking API Provisioning Cancelled
Technical Specifications
04/13/2026
Mail.dat Technical Specifications R64.0.0.0
Data Files
04/13/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
04/13/2026
City/State ZIP Code Weekly Compare
Data Files
04/13/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
04/13/2026
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
04/13/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
04/13/2026
AIS County Name Table Layout (AISCNTY.TXT)
Data Files
04/13/2026
AMS County Name Table (COUNTY_NAME_TABLE.TXT)