Martin Marietta Aggregates is one of the largest producers of construction aggregates in the United States. Located in Theodore, Ala., the company supplies crushed stone, sand and gravel used to build the roads, sidewalks and foundations. It also provides asphalt and concrete in select geographic areas. Additionally, the company engages in aggregates performance testing and research. Martin Marietta Aggregates operates more than 285 quarries and distribution facilities in 28 states, the Bahamas and Nova Scotia, Canada.