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Tri-City is a census-designated place (CDP) in Douglas County, Oregon, United States. As of the 2020 census, Tri-City had a population of 4,019. The community in floodplain near the Umpqua River is named for the three cities among which it is centered: Myrtle Creek, Canyonville and Riddle. The Tri City School District may have originated the name, which was later adopted by the local sewer district and the former Tri City State Airport.