The Tillamook State Forest is a 364,000 acres (1,470 km²) publicly owned forest in the U.S. state of Oregon. Managed by the Oregon Department of Forestry, it is located 40 miles (64 km) west of Portland in the Northern Oregon Coast Range, and spans Washington, Tillamook, Yamhill, and Clatsop counties. The forest receives large amounts of precipitation and is dominated by Douglas-fir trees.