Exhibit 99.1

                             Section 906 Certification

The undersigned officer of MASSBANK Corp. (the "Company") hereby certifies that
the Company's annual report on Form 10-K for the year ended December 31, 2002
(the "Report"), as filed with the Securities and Exchange Commission on the date
hereof, fully complies with the requirements of Section 13(a) or 15(d), as
applicable, of the Securities Exchange Act of 1934, as amended, and that the
information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company. This
certification is provided solely pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and shall not be
deemed to be a part of the Report or "filed" for any purpose whatsoever.


Date: March 24, 2003                          /s/ Gerard H. Brandi
                                              ----------------------------------
                                              Name: Gerard H. Brandi
                                              Title: President & CEO