MLM Martin Marietta Materials Inc

Anne H. Lloyd, Senior Vice President, Chief�Financial Officer and Treasurer of Martin Marietta Materials, Inc. (NYSE:MLM), today announced that the Board of Directors has declared a regular quarterly cash dividend of $0.345 (thirty-four and one-half cents) per share on the Corporation�s common stock. This dividend, which represents a cash dividend of $1.38 per share on an annualized basis, is payable June 30, 2008, to shareholders of record at the close of business on June 3, 2008. Martin Marietta Materials is a leading producer of construction aggregates and a producer of magnesia-based chemicals and dolomitic lime. For more information about Martin Marietta Materials, refer to the Corporation's Web site at www.martinmarietta.com. MLM-D