Labeling List Changes Effective September 1, 2026

Effective September 1, 2026, the Postal Service™ will revise Labeling List(s) L007, L008, L012, L016, L201, L606, and L607 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the September 1, 2026, effective date through October 31, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22708.

 

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.

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 LACS^Link®.

Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q3 FY26)

ACS Nixie stats by industry for FY26 Q3.

June 2026 Nixie Volume

This spreadsheet contains the UAA statistics for June 2026.

ZIP Codes by Area and District codes

The Excel spreadsheet lists ZIP Codes with the associated Area and District Codes.  

Informed Delivery® Post-Campaign (IDPC) Data through IV-MTR® Data Dictionary

This document describes the Informed Delivery Post-Campaign (IDPC) data fields available through the IV-MTR application.

Updated List: Service Type Codes for Intelligent Mail® Package Barcode (IMpb)

This document provides the updated service type codes for  Intelligent Mail® Package Barcodes.

May 2026 Nixie Volume

This spreadsheet contains the UAA statistics for May 2026.

Population Mobility Trends 12-Month Historical (CSV) Sample File