Headquartered in Raleigh, North Carolina, Martin Marietta Materials is the second largest producer of crushed stone, sand and gravel in the United States. The Company's network of approximately 360 operations and distribution facilities spans coast to coast through 28 states, the Bahamas and Nova Scotia. Martin Marietta is ... a leading producer of magnesia-based chemical products used in a wide variety of industrial, environmental and chemical applications. In addition, the Corporation has invested in technology-based growth opportunities in structural composites, namely bridge decks, specialty truck trailers and railcar components, and microwave technology.