EXHIBIT 99.1 FOR IMMEDIATE RELEASE BANK CONTACT: PAUL A. MILLER (978) 725-7555 LSB CORPORATION DIVIDEND YIELD 3.04% NORTH ANDOVER, Mass. -- (BUSINESS WIRE) - April 23, 2004, LSB Corporation, (NASDAQ - LSBX), today announced the Board of Directors of LSB Corporation declared a dividend to shareholders on April 22, 2004. The Board voted to pay a cash dividend of $0.13 per share on its outstanding shares of common stock payable on May 20, 2004 to shareholders of record at the close of business on May 6, 2004. This represents a 3.04% dividend yield based on the stock price at the close of business on April 22, 2004. LSB Corporation is the parent holding company of its wholly-owned subsidiary Lawrence Savings Bank located in North Andover, Massachusetts, an Equal Housing Lender and Member, FDIC/Depositors Insurance Fund.