Addressing Requirements

Effective March 29, 2009, new address placement and formatting requirements adopted by the Postal Service® for Periodicals, Standard Mail®, Bound Printed Matter, Media Mail®, and Library Mail flat-size pieces sent at automation, presorted, or carrier route prices were implemented. USPS® also adopts related revisions for automation and presorted First-Class Mail® flats. New requirements were published in the Federal Register May 7, 2008.

The following collection of resources provides details necessary to stay compliant with addressing requirements.

For Mailpiece design online info please click here.

For information on the mailpiece design professional helpdesk please click here.

Featured Resources

Fact Sheets
12/08/2025
Addressing Fact Sheet for First-Class Flats

FAQs
11/02/2020
Addressing Fact Sheet for Periodicals Flats

Fact Sheets
12/03/2025
Addressing Fact Sheet for USPS Marketing Mail Flats

Fact Sheets
11/02/2020
Addressing Fact Sheet for Package Services Flats

Presentations
01/01/2009
New Address Standards for Commercial Flat-Size Mail Presentation

Fact Sheets
03/29/2009
New Address Standards for Flat-Size Mail Poster

Fact Sheets
03/29/2009
New Address Requirements for Automation, Presorted, and Carrier Route Flat-Size Mail