Clowwewalla Indians were located at the falls of Willamette River in Oregon.
Clatsop Indians. The Clatsop centered about Cape Adams, on the south side of Columbia River, extending up the latter as far as Tongue Point and southward on the Pacific coast to Tillamook Head.
Clatskanie Indians. According to Gibbs (1877) the Clatskanie at one time owned the prairies bordering Chehalis River, Washington, at the mouth of Skookumchuck River, but on the failure of game, crossed the Columbia and occupied the mountains about Clatskanie River, their best-known historic seat. For a long time they exacted toll of all who passed going up or down the Columbia.
Chetco Indians were located on each side of the mouth of Chetco River and about 14 miles up it as well as on Winchuck River in Oregon and California.
Chastacosta Indians were located on the lower course of Illinois River, both sides of Rogue River for some distance above its confluence with the Illinois, and on the north bank somewhat farther in Oregon.
Cayuse Indians were located about the heads of Walla Walla, Umatilla, and Grande Ronde Rivers and extending from the Blue Mountains to Deschutes River, Washington and Oregon.
Atfalati Indians were located on the Atfalati plains, the hills about Forest Grove and the shores and vicinity of Wapato; they are also said to have extended as far as the site of Portland, all in the present state of Oregon.
Alsea Indians were located on Alsea River and Bay in Oregon.
Ahantchuyuk Indians were located on and about Pudding River, which empties into the Willamette from the east about 10 miles south of Oregon City, Oregon.
Calapooya Indians were located on the headwaters of Willamette River including McKinzie, Middle, and West Forks in Oregon.