1.6 Plateau

- Cayuse, Oregon
- Celilo (Wayampam)
- Upper Chinookan (Dialects: Clackamas, Cascades, Hood River, Wasco-Wishram language, Kathlamet, Cathlamet, Multnomah)
- Columbian (Dialects: Wenatchee, Sinkayuse, Chelan)
- Coeur d'Alene, Idaho
- Colville, Washington
- Upper Cowlitz
- Flathead (Selisch or Salish), Idaho and Montana
- Klamath, Oregon
- Klickitat Tribe, Washington
- Kootenai/Ktunaxa, British Columbia, Montana, and Idaho
- Lower Snake (Chamnapam, Wauyukma, Naxiyampam)
- Modoc, California and Oregon
- Molala (Molale), Oregon
- Nez Perce, Idaho
- Nicola Athapaskans (extinct)
- Nicola people (confederacy)
- Nlaka'pamux, British Columbia, formerly known as the Thompson people
- Okanagan (Syilx), British Columbia and Washington
- Palus (Palouse)
- Pend'Oreilles (Kalispel), Washington
- Rock Creek
- Sahaptin people
- Sanpoil (tribe)
- Secwepemc (Shuswap), British Columbia
- Sinixt (Lakes), British Columbia, Washington, Idaho
- Spokane, Washington

- St'at'imc (Lillooet)
o Lil'wat
o In-SHUCK-ch

- Tygh
- Tygh Valley
- Umatilla, Oregon
- Upper Nisqually (Mishalpan)
- Walla Walla, Oregon
- Wanapum
- Wasco-Wishram, Oregon
- Yakama, Washington