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

A CASS file is a program file used to emulate a cassette-based program created for the Apple II computer. It contains a copy of the data stored on an Apple II cassette, converted for use with Virtual , an Apple II emulator.

NCOA helps reduce undeliverable-as-addressed mail by correcting input addresses prior to mailing. The Coding Accuracy Support System (CASS) improves the accuracy of carrier route, five-digit ZIP, ZIP+4, and delivery point codes that appear on mail pieces.

The CASS (Coding Accuracy Support System) is a USPS (United States Postal Service) process designed to improve the accuracy of your mailings by verifying your address list against an official list of all known deliverable addresses in the United States.

For a small list, they typically charge around $30. CASS certification is also generally included at no extra charge as part of the National Change of Address (NCOA) service, so if you are already doing NCOA, you don't need to pay anything more for CASS.

CASS certification is offered to all mailers, service bureaus, and software vendors that would like the USPS to evaluate the quality of their address-matching software and improve the accuracy of their ZIP+4, carrier route, and five-digit coding.

Coding Accuracy Support System (CASS) is a certification system from the United States Postal Service (USPS) for address validation. A CASS-certified address validation service will standardize your mailing list, update outdated addresses, and verify that addresses are valid and complete.