Tharco manufactures packaging products for shipping, display, and in-plant handling applications. It offers single, double and triple-wall paper and plastic corrugated products; custom foam packaging products; and corrugated fiberboard boxes. The company also provides structural design services. Since its inception in 1951, Tharco has worked to become the largest manufacturer of unprinted corrugated stock boxes in the United States. Headquartered in San Lorenzo, California, Tharco has manufacturing facilities in California, Colorado, Georgia, Texas and Washington and distribution facilities in Arizona, Oregon and Utah.