Exhibit 32

                            CERTIFICATION PURSUANT TO
                             10 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Cass Information Systems, Inc. ("the
Company") on Form 10-Q for the period ended June 30, 2003 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), we,
Lawrence A. Collett and Eric H. Brunngraber, Chairman and Chief Executive
Officer and Chief Financial and Accounting Officer, respectively, of the
Company, certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906
of the Sarbanes-Oxley Act of 2002, that:

      (1)   The Report fully complies with the requirements of section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      (2)   The information contained in the Report fairly presents, in all
            material respects, the financial condition and result of operations
            of the Company.


        /s/ Lawrence A. Collett
- ----------------------------------------
          Lawrence A. Collett
  Chairman and Chief Executive Officer
            August 8, 2003


         /s/ Eric H. Brunngraber
- ----------------------------------------
           Eric H. Brunngraber
       Vice President - Secretary
(Chief Financial and Accounting Officer)
             August 8, 2003

A signed original of this written statement required by Section 906 has been
provided to Cass Information Systems, Inc. and will be retained by Cass
Information Systems, Inc. and furnished to the Securities and Exchange
Commission or its staff upon request.