What were the most populous tribes in the Pacific Northwest?

If one wishes to extend the Pacific Northwest to Alaska, one can consider the Tlingit and Nootka tribes. In Idaho and Washington state, there are the Nez Perce, Palouse, and Walla Walla tribes. The Chinook tribe was important on Washington's Pacific Coast. Paiute and Shoshone tribes made up most of interior Oregon. The Klamath and Modoc people were also common in and around the Willamette Valley in Oregon, where they would fight a disastrous war with settlers in 1851 after the Whitman Massacre.  
By the time American settlers started arriving in earnest in the 1840s and 1850s, one could not call any of these tribes very populous due to diseases spread by Spanish and Russian traders, as well as the Lewis and Clark voyage of 1804-1805. The Nez Perce is probably the best-known from this list due to Chief Joseph's escape from reservation life in the late 1870s.  
http://www.oregonpioneers.com/tribe.htm