Fact Sheets
11/10/2026
Mailer Identifier (MID) Exception Process

The Postal Service will issue a Mailer Identifier (MID) to a mailer for use in the Intelligent Mail® container barcode, Intelligent Mail® tray barcode, Intelligent Mail® barcode or Intelligent Mail® package barcode. The MID is a field within the Intelligent Mail barcodes and is used to identify the mailer.

Announcements
11/09/2026
INFORMATIONAL - REMINDER - FY2027 Peak Season Network Update Webinars Begin
Announcements
11/09/2026
News You Need to Know from MTAC - October 2026
Data Files
11/09/2026
Informed Visibility Mail Tracking & Reporting Machine Count

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

Data Files
11/09/2026
***Updated - New Areas*** - Area District 5-digit ZIP Codes (AREADIST_ZIP5.TXT)
Data Files
11/09/2026
City/State ZIP Code Weekly Compare
Data Files
11/09/2026
3 Digit ZIP/AISU Office List (AISUREPT.TXT)
Data Files
11/09/2026
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
11/09/2026
AIS Congressional District File (CONG_DIST.TXT)
Data Files
11/09/2026
AIS County Name Table Layout (AISCNTY.TXT)