Labeling lists change frequently and are published in the Postal Bulletin. Mailers may also subscribe to labeling list products and updates using PS Form 8184. For more information contact the National Customer Support Center at 800-238-3150.
L001 5-Digit Scheme—Periodicals, Standard Mail, and Package Services Flats and Irregular Parcels
L002 3-Digit ZIP Code Prefix Matrix
L003 3-Digit ZIP Code Prefix Groups—3-Digit Scheme Sortation
L004 3-Digit ZIP Code Prefix Groups—ADC Sortation
L005 3-Digit ZIP Code Prefix Groups—SCF Sortation
L006 5-Digit FSS Scheme—Periodicals, Standard Mail, and Package Services Flats in Bundles
L007 5-Digit Scheme—Periodicals, Standard Mail, and Package Services Flats in Bundles
L008 3-Digit Scheme—Periodicals, Standard Mail, and BPM Flats in Bundles
L009 Mixed ADCs—Periodicals, Package Services Flats and Irregular Parcels and Standard Mail Flats
L010 NDC/ASF Entry—Standard Mail Letters and Package Services Irregular Parcels
L011 Non-NDC/ASF Entry—Periodicals and Standard Mail Letters
L012 5-digit ZIP Scheme Combination
L200 Periodicals and First-Class Mail
L201 Periodicals Origin Split and First-Class Mail Mixed ADC/AADC
L600 Standard Mail, Package Services, and Parcel Select Regional Ground
L601 Network Distribution Centers (NDCs)
L603 Reserved
L604 Reserved
L605 NDCs/ASFs—Nonmachinable Parcel Post NDC Presort and ONDC Presort
L606 5-Digit Scheme—Standard Mail, First-Class Mail, and Package Services Parcels
L607 3-Digit ZIP Code Sort Option for Drop-Ship Mailers