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08/28/2025
CASS™ Certified Products Guide: Vendor/Service Licensees Data File Cycle O - (Expires July 31, 2028)
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08/28/2025
CASS™ Certified Products Guide: Vendor/Service Bureaus Licensees Cycle O - (Expires July 31, 2028)
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08/28/2025
CASS™ Certified Products Guide: DSF2® Licensees Data File Cycle O - (Expires July 31, 2028)
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08/28/2025
DSF2® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
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08/28/2025
DPV® Licensees Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
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08/28/2025
DPV® Licensees Cycle O: Certified Products Guide - (Expires July 31, 2028)
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08/28/2025
CASS™ Software Manufacturers Data File Cycle O: Certified Products Guide (D) - (Expires July 31, 2028)
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08/28/2025
CASS™ Software Manufacturers Cycle O - (Expires July 31, 2028)
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08/28/2025
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.

User Guides
08/28/2025
USPS Verification of Periodicals Advertising Percentage – Alternate Marked Copy Program