Archaeological evidence (Marmes Rockshelter, East Wenatchee Clovis cache, Kennewick Man/Ancient One) confirms human presence in present-day Washington State for at least 13,500 years—since the end of the last Ice Age.
| People | Region | Key Features |
|---|---|---|
| Chinook | Lower Columbia River, coast | Trade language (Chinook Jargon), plank houses, salmon economy |
| Nisqually | South Puget Sound | River/tideland resources, Medicine Creek Treaty (1854) |
| Suquamish | Kitsap Peninsula, Bainbridge | Chief Seattle (Si'ahl), saltwater people, canoe culture |
| Sammamish | Lake Sammamish/Sammamish River | Lake/river resources; merged into Snoqualmie |
| Clallam (Klam) | Olympic Peninsula, Strait of Juan de Fuca | Marine hunters, Treaty of Point No Point (1855) |
| Spokane (Spq'n'i') | Spokane River, Eastern WA | Plateau culture, salmon, camas, horses; Spokane Falls center |
| Yakama | Yakima Valley, Columbia Basin | 14 bands, Treaty of 1855, major fishing rights |
| Nez Perce | SE WA (Palouse, Snake River) | Chief Joseph, Appaloosa horses, 1877 flight |
| Makah | Cape Flattery (NW tip) | Whaling (only US treaty right), Ozette village archaeology |
| Colville Confederated Tribes | North Central WA | 12 bands, Grand Coulee Dam displacement |