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 approved a 16 percent increase in the regular quarterly cash dividend to $0.40 (forty cents) per share on the Corporation�s common stock. This dividend, which represents a cash dividend of $1.60 per share on an annualized basis, is payable September 30, 2008, to shareholders of record at the close of business on August 29, 2008. Commenting on the dividend increase, Lloyd stated, "We are very pleased that our cash generation has enabled us to increase shareholder returns through the dividend payout. The Corporation has raised its dividend each year since paying its first dividend in 1994. In addition to the dividend payout, the Corporation has made continued investment in internal growth opportunities and value-added business development opportunities to enhance long-term shareholder return." 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