O.C. Cluss Lumber & Building Supplies was founded in 1918 by Otto Charles (O.C.) Cluss. Its products and inventory include lumber and plywood, windows and doors, building materials, roofing and siding, mouldings and millwork, tools and hardware, kitchen and bath, home decor and lighting and electrical. O.C. Cluss has eight locations throughout Pennsylvania, Maryland and West Virginia. Cluss is firmly established as a major regional supplier in the lumber and building materials industry. Pro Sales magazine ranked O. C. Cluss as the #61 largest building materials supplier in the Unitied States. The company is a family owned business.