Release Notes
03/11/2026
USPS APIs Release Notes

For the latest updates, please review the USPS APIs Release Notes.

Announcements
03/10/2026
INFORMATIONAL - Commercial Systems Release March 12, 2026
Tech Guides
03/10/2026
USPS Ship Misshipped Tech Sheet
Announcements
03/09/2026
DELIVERY - DPO Suspensions March 9, 2026
Program Requirements
03/09/2026
2026 Promotions FAQ
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)
Data Files
03/09/2026
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
03/09/2026
AIS Congressional District File (CONG_DIST.TXT)