Founded in 1925, Hills Materials Company is an integrated construction materials company that provides Red-E-Mix concrete products to clients. It offers asphalt production and site development solutions. The company operates an equipment repair facility, as well as several limestone quarries, asphalt plants, and sand and gravel pits. It is a contractor for various phases of highway and utility constructions. Hills Materials Company offers drainage control development services, as well as constructs driveways, underground utilities, streets and parking lots. Its client list includes the South Dakota Department of Transportation, Ellsworth Air Force Base and various municipalities. Hills Materials Company maintains a location in Rapid City, S.D.