EXHIBIT 99.1



                            CERTIFICATION PURSUANT TO
                             18 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 Citizens Banking Corporation (the
"Company") on Form 10-Q for the period ending June 30, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, William
R. Hartman, Chief Executive Officer of the Company, certify, pursuant to Section
906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

     (1)  The Report fully complies with the requirements of Section 13(a) 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 results of operations
          of the Company.


Dated: August 14, 2002


                                                        /s/ William R. Hartman
                                                        -----------------------
                                                        William R. Hartman
                                                        Chief Executive Officer