Labeling lists change frequently and are published and updated in the online DMM on Postal Explorer (pe.usps.com). Click on "Domestic Mail Manual (DMM)," then "Labeling Lists" under Index and Appendices.
Mailers may also subscribe to labeling list products and updates using Form 8184 (click on "Business Forms" on Postal Explorer). For more information contact the National Customer Support Center at 800-238-3150.