The Sauk are the ethnic group who make up the majority of the population of the tribe today, while "Suiattle" (Lushootseed: suyaƛ̕bixʷ, lit.

The first part of the name, saʔqʷəbixʷ (also spelled saʔkʷbixʷ or saʔkʷəbixʷ) was recorded on the Treaty of Point Elliott as "Sah-ku-méhu" or "Sah-ku-me-hu.

[7] The Sauk continued to seek reparations from the United States government, and in 1936, sued in the Indian Claims Commission.

Their case was dismissed as the commission found that they were not a distinct tribal entity, separate from the Upper Skagit Indian Tribe (with whom they were currently affiliated).

[8] In 1946, the Sauk separated from the Upper Skagit, forming their own government and seeking federal recognition as a sovereign nation.

It lies in two non-contiguous sections: the largest (48°19′16″N 121°32′59″W / 48.32111°N 121.54972°W / 48.32111; -121.54972) is in southern Skagit County, comprising 33.5 acres (13.6 hectares), or 73.5 percent of the reservation's total land area and all of its resident population of 45 persons (2000 census); the smaller section (48°17′25″N 121°32′36″W / 48.29028°N 121.54333°W / 48.29028; -121.54333), in northern Snohomish County, has a land area of 12.1 acres (4.9 hectares) and no resident population.

The department provides health care, social services, drug and alcohol prevention, rehabilitation, and counseling.

The tribe also operates a preschool and daycare on the reservation, where they offer nutrition, language, wellness, and family services.

[1] It opened a casino and bingo hall located on Washington State Route 530 in September 2018 It closed less than a year later.

Individuals seeking to enroll must have at least 1/4 Indian blood and proof of descendancy from one or more Native American ancestors recorded in the 1942 federal census as living in the Sauk River valley.

[14] The last native speaker of the Lushootseed language within the Sauk-Suiattle community, Katherine Brown Joseph, died in 2007.