Effective January 18, 2026, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), sections 204.3.2 and 705.8.10, to clarify the labeling standards for Plus-One mailpieces.
These standards will become effective on January 18, 2026.
Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM)
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200 Commercial Mail Letters, Cards, Flats, and Parcels
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204 Barcode Standards
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3.0 Standards for Barcoded Tray Labels, Sack Labels, and Container Labels
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3.2 Specifications for Barcoded Tray and Sack Labels
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3.2.4 3-Digit Content Identifier Numbers
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Exhibit 3.2.4 3-Digit Content Identifier Numbers
HUMAN-READABLE
CLASS AND MAILING CIN CONTENT LINE
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USPS MARKETING MAIL
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MKT Letters — Automation
[Revise the text of section “MKT Letters – Automation” to read as follows:]
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700 Special Standards
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705 Advanced Preparation and Special Postage Payment Systems
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8.0 Preparing Pallets
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8.10 Pallet Presort and Labeling
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8.10.3 USPS Marketing Mail – Bundles, Sacks, or Trays
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[Revise the third sentence of the introductory text of item c. to read as follows:]
c. ***The pallet must contain only carrier-route mail for the same 5-digit ZIP Code.***
[Revise the text of item c(2) to read as follows:]
2. Line 2: For flats only, “STD FLTS” or “STD MKTG,” as applicable; followed by “HD/HD+” for High Density and High Density Plus flats pricing eligibility; followed by “CARRIER ROUTES” (or “CR-RTS). For letters, “STD LTRS”; followed by “CARRIER ROUTES” (or “CR-RTS”); followed by “BC” if the pallet contains barcoded letters; followed by “MACH” if the pallet contains machinable letters; followed by “MAN” if the pallet contains nonmachinable letters; followed by “P1” if the pallet contains Plus-One pieces.
[Revise the introductory text of item d. to read as follows:]
d. 5-digit, required except for trays, permitted for bundles, trays, and sacks (when applicable). The pallet must contain only automation-price and Presorted-price mail for the same 5-digit ZIP Code or same 5-digit scheme. Five-digit scheme bundles and trays are assigned to 5-digit pallets according to the “label to” 5-digit ZIP Code. Labeling:
[Revise the text of item d(2) to read as follows:]
2. Line 2: For flats and nonstandard parcels, use “STD” followed by “FLTS” or “NONSTD,” as applicable; followed by “5D” followed by “BARCODED” (or “BC”) if the pallet contains automation-price mail; followed by “NONBARCODED” (or “NBC”) if the pallet contains Presorted-price mail. For letters, use “STD LTRS 5D”; followed by “BC” if the pallet contains barcoded letters; followed by “MACH” if the pallet contains machinable letters; followed by “MAN” if the pallet contains nonmachinable letters; followed by “P1” if the pallet contains Plus-One pieces.
[Revise the first sentence of the introductory text of item e. to read as follows:]
e. 3-digit, optional. Option is not available for parcels or for bundles for 3-digit ZIP Code prefixes marked “N” in L002.***
[Revise the text of item e(2) to read as follows:]
2. Line 2: For flats, “STD” followed by “FLTS;” followed by “3D”; followed by “BARCODED” (or “BC”) if the pallet contains automation price-mail; followed by “NONBARCODED” (or “NBC”) if the pallet contains carrier-route and Presorted-price mail. For letters, “STD LTRS 3D”; followed by “BC” if the pallet contains barcoded letters; followed by “MACH” if the pallet contains machinable letters; followed by “MAN” if the pallet contains nonmachinable letters; followed by “P1” if the pallet contains Plus-One pieces.
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[Revise the text of item f(2) to read as follows:]
2. Line 2: For flats and nonstandard parcels, “STD” followed by “FLTS” or “NONSTD,” as applicable; followed by “SCF”; followed by “BARCODED” (or “BC”) if the pallet contains automation-price mail; followed by “NONBARCODED” (or “NBC”) if the pallet contains carrier-route and Presorted-price mail. For letters, “STD LTRS SCF”; followed by “BC” if the pallet contains barcoded letters; followed by “MACH” if the pallet contains machinable letters; followed by “MAN” if the pallet contains nonmachinable letters; followed by “P1” if the pallet contains Plus-One pieces.
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The Postal Service will incorporate these revisions into the next edition of the online DMM, which is available via Postal Explorer® at pe.usps.com.
— Product Classification,
Product Solutions, 1-8-26
