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CASS™ Certification

The Coding Accuracy Support System (CASS) enables the USPS to evaluate the accuracy of software that corrects and matches street addresses. 1

CASS™ Certification

A service provider that meets all of the stringent USPS accuracy requirements is CASS-Certified™.2

Why CASS-Certified™ vendors matter

Once an address has been cleaned up, standardized, and verified as deliverable, you can be nearly 100% sure that it will be delivered as expected.3

  1. CASS™ System, USPS <>
  2. Coding Accuracy Support System, Wikipedia <>
  3. Of course things like meteorites, volcanoes, or a loose pack of rabid dogs can still cause delays to postal delivery. But at least you can say you did your best.