EXHIBIT 99

                            CERTIFICATION PURSUANT TO
                   TITLE 18, UNITED STATES CODE, SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


         In connection with the Quarterly Report of Peoples Bancorp Inc.
("Peoples Bancorp") on Form 10-Q for the quarter ended March 31, 2003, as filed
with the Securities and Exchange Commission on the date hereof (the "Report"),
I, Robert E. Evans, President and Chief Executive Officer of Peoples Bancorp,
and I, John W. Conlon, Chief Financial Officer and Treasurer of Peoples Bancorp,
certify, pursuant to Title 18, United States Code, Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of
their knowledge:

     (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 results of operations
          of Peoples Bancorp.


Date:  May 9, 2003           /s/ ROBERT E. EVANS*
                                 -----------------------------------
                                 Robert E. Evans
                                 President and Chief Executive Officer



Date:  May 9, 2003           /s/ JOHN W. CONLON*
                                 -----------------------------------
                                 John W. Conlon
                                 Chief Financial Officer and Treasurer


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