Tri-City (or Tri City) is a census-designated place (CDP) in Douglas County, Oregon, United States.

[5] 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 (now known as the Myrtle Creek Municipal Airport).

[6] According to the United States Census Bureau, the CDP has a total area of 7.2 square miles (18.7 km2), all of it land.

20.0% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older.