With its roots dating back to the mid-1800s, Stimson Lumber is one of the oldest operating forest products companies in the US. Stimson Lumber owns and manages about 500,000 acres of timberland in the western US. The company has manufacturing operations in Idaho, Montana, Oregon, and Washington. It makes dimension lumber, fingerjointed studs, structural posts, and hardboard paneling, as well as decking, fence railing, and exterior trim products made from fir, pine, and cedar. The privately-held company sells these products to customers throughout the US and in select international markets.