Exhibit 32.2

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 on Form 10-Q of MASSBANK Corp. (the “Registrant”) for the period ended September 30, 2006 (the “Report”) as filed with the Securities and Exchange Commission on the date hereof, I, Reginald E. Cormier, Sr. Vice President, Treasurer and Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 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. To my knowledge, the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant as of and for the period covered by the report.

Dated: November 7, 2006

/s/ Reginald E. Cormier

Reginald E. Cormier

Sr. Vice President, Treasurer

Chief Financial Officer

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate disclosure document.