06/05/2026
06/03/2026
05/29/2026
05/27/2026
Labeling List Changes Effective July 1, 2026
Effective July 1, 2026, the Postal Service™ will revise Labeling List(s) L001, L007, L009, L012, L016, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the July 1, 2026, effective date through August 31, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22704.
05/03/2026
04/30/2026
04/15/2026
Appendix B: ACS™ Frequently Asked Questions
This document provides frequently asked questions (FAQs) and answers about the Intelligent Mail® Barcode, Traditional ACS™, OneCode ACS™, Full Service ACS™, Single Source ACS™, and the Intelligent Mail® Package Barcode (IMpb).
04/02/2026
03/02/2026
02/27/2026
01/30/2026
01/30/2026
01/27/2026
Labeling List Changes Effective March 1, 2026
Effective March 1, 2026, the Postal Service™ will revise Labeling List(s) L001, L002, L004, L005, L007, L009, L012, L015, L016, L051, L201, L601, L605, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the March 1, 2026, effective date through April 30, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22696.
12/31/2025
12/01/2025
10/31/2025
10/29/2025
08/31/2025
07/30/2025
06/30/2025
06/27/2025
Labeling List Changes Effective August 1, 2025
Effective August 1, 2025, the Postal Service™ will revise Labeling List(s) L002, L004, L005, L007, L010, L012, L601, L605, and L606 to reflect changes in mail processing operations.
05/30/2025
05/02/2025
04/30/2025
02/28/2025