The Coos Bay Mosquito Fleet comprised numerous small steamboats and motor vessels which operated in the late 19th and early 20th centuries on Coos Bay, a large and mostly shallow harbor on the southwest coast of the U.S. state of Oregon, to the north of the Coquille River valley. Coos Bay is the major harbor on the west coast of the United States between San Francisco and the mouth of the Columbia River.

North Bend is a city in Coos County, Oregon, United States with a population of 9,695 as of the 2010 census. North Bend is surrounded on three sides by Coos Bay, an S-shaped water inlet and estuary where the Coos River enters Coos Bay and borders the city of Coos Bay to the south. North Bend became an incorporated city in 1903.