Exhibit 21 SUBSIDIARY OF LSB CORPORATION Lawrence Savings Bank: LSB Corporation's wholly owned subsidiary is a Massachusetts-chartered savings bank organized in 1868 and headquartered at 30 Massachusetts Avenue, North Andover, Massachusetts. SUBSIDIARIES OF LAWRENCE SAVINGS BANK Pemberton Corporation: Holds real estate for sale. Spruce Wood Realty Trust: Holds real estate used in the normal course of business. Shawsheen Security Corporation and Shawsheen Security Corporation II: Engages exclusively in buying, selling, dealing in and holding investment securities on its own behalf. Each of the subsidiaries is organized or incorporated in Massachusetts.