Stillaguamish people today are descendents of the Stoluck-wa-mish River Tribe, who lived along the Stillaguamish River in the 1850s. They signed the Point Elliott Treaty on 22 January 1855, as the "Stoluck-wa-mish." Many members of the tribe moved to the Tulalip Reservation, and others stayed along the river. Years later the Stillaguamish Reservation was established.
The Stillaguamish Tribe of Washington ratified its constitution on 31 January 1953, establishing a democratically-elected, six-member tribal council.