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09/18/2025
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
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09/18/2025
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
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09/18/2025
CASS™/MASS™ Certified Products Guide - All Sections Data Files Cycle O - (Expires July 31, 2028)

This document contains the certified vendors list for CASS™ and MASS™ products for Cycle O.

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09/04/2025
Mail Service Provider (MSP) - Full-Service Certified Mailers

A Mail Service Provider (MSP) offers a variety of solutions to prepare and present Full-Service presort mailings. For more information regarding Certified MSPs, please follow this link: https://postalpro.usps.com/full-service-cert/fact-sheet

 

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08/28/2025
LACSLink® Developers (PDF)

This document contains a contact list of LACSLink® developers.

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08/28/2025
LACSLink® Distributors (PDF)

This document contains the contact list of LACSLink® distributors. 

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08/27/2025
USPS® Approved Manufacturers of Mailing Containers for Adult Birds

A list of contact information for adult bird container manufacturers that have been certified by USPS.

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08/26/2025
Polywrap Manufacturer List
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08/07/2025
Certified Election Mail Service Providers
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08/07/2025
NCOALink® Licensed Interface Distributors

This document contains contact information for NCOALink® Licensed Interface Distributors.