Tri-City is a census-designated place in Douglas County, Oregon, United States. The population was 3,931 at the 2010 census. 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 adopt…Tri-City is a census-designated place in Douglas County, Oregon, United States. The population was 3,931 at the 2010 census. 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.
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