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Coos Bay, city, Coos county, southwestern Oregon, U.S., on Coos Bay (an inlet of the Pacific), adjacent to North Bend, Eastside, and the port of Charleston. The original inhabitants of the region include the Coos, Lower Umpqua, and Siuslaw peoples, who formed a confederation in 1855. Fur trappers visited the region in the early 1800s, and the area was settled in 1854 by J.C. Tolman, who named it Marshfield after his hometown in Massachusetts. Shipbuilding...