Here are the clickable links available through Anc.
U.S., Schedules of Special Census of Indians, 1880
Round Valley Agency; Round Valley Reservation
Standing Rock Agency; Standing Rock Reservation
Tulalip Agency; Swinhomish, Muckleshoot and Lummi Reservations and Indians not on a reservation
Tulalip Agency; Tulalip and Port Madison Reservations
Yakama Agency; Yakama Reservation
Is there a specific tribe that you are searching? I don't know if this is of interest, but Anc. has the following database:
Washington, Enrollment and Allotment Applications of Washington Indians, 1911-1919
with the following tribes listed:
Alaskan, Chehalis, Chimacum, Chinook, Clallam, Cowlitz
Duwamish, Gig River, Hoh River, Kikealis, Klickitat, Lummi
Mitchell Bay, Montesano, Muckleshoot, Nisqually, Nooksack
Oregon, Puyallup, Quileyute, Quinaielt, San Juan, Sanpete
Satsop, Shoalwater Bay, Skagit, Skokomish, Snohomish
Snoqualmie, Spusum, Squaxin Island, Steilacoom, Stillaguamish
Suquamish, Swinomish, Wynookie