Announcements
04/13/2026
INFORMATIONAL - USPS Enhanced Addresses API – Coming July 2026
Release Notes
04/13/2026
PTR2 Release Notes_DD_04_18_26
Announcements
04/13/2026
INFORMATIONAL - Informed Delivery Campaign Reporting Update April 2026
Applications/ Forms
04/13/2026
Addressing API License Agreement
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)
Contact Lists
04/13/2026
AMS Address Report: AISU Mailing List (ADDRREPT.TXT)
Data Files
04/13/2026
AISU ZIP Code Record and AISU Address Record Descriptions (AISULOUT.TXT)
Data Files
04/13/2026
AISU ZIP Code File (AISUZIPS.TXT)
Data Files
04/13/2026
AISU Contact Information (AISUADDR.TXT)
Data Files
04/13/2026
Area District Finance File Specification (AREA_DIST_LAYOUT.TXT)
Data Files
04/13/2026
Area District Finance File (AREADIST.TXT)
Data Files
04/13/2026
Area/District 3-digit and 5-digit ZIP Code Assignments (AREA_DIST_ZIP.TXT)
Data Files
04/13/2026
Move to Competitive Street Addressing (MTC SA) List

This .txt file contains the MTC SA List.

Announcements
04/10/2026
INFORMATIONAL - July 2026 Market Dominant Price Change Filing Webinar - Friday, April 17, 2026
Announcements
04/10/2026
DELIVERY - Southern Area - AR-OK District - Wilton Post Office (71865) - Permanently Suspended
Announcements
04/10/2026
INFORMATIONAL - Time Limited Price Change 2026 Commercial System Releases – April 12, 2026