Martin Marietta Aggregates got true grit. The company produces and supplies crushed granite and limestone, sand, and gravel for highway and public infrastructure, residential, and commercial projects in the US (primarily in the South and Midwest), Canada, and the Caribbean. It operates about 275 quarries, underground mines, and distribution facilities. Martin Marietta Aggregates also produces asphalt and ready-mix concrete and operates a road paving business. The company accounts for more than 90% of parent Martin Marietta Materials' sales.