X0202 4 2005-05-31 0 0000799166 MASSBANK CORP MASB 0001235392 STACKHOUSE DONALD D C/O MASSBANK CORP 123 HAVEN STREET READING MA 01867 1 0 0 0 common stock MASSBANK 2005-05-31 4 S 0 1600 35.40 D 15985 D Includes 7,835 shares owned directly by Dr.Donald B. Stackhouse and 8,150 shares owned indirectly by Dr. Stackhouse (owned by the spouse of Dr. Stackhouse). Dr. Stackhouse disclaims beneficial ownership of these 8,150 shares and the filing of this report shall not be deemed an admission that Dr. Stackhouse is the beneficial owner. Dr. Donald B. Stackhouse 2005-05-31