[2] The county was created in 1863[3] and named after Isaac Stevens, the first governor of Washington Territory.

Stevens County is included in the Spokane-Spokane Valley, WA Metropolitan Statistical Area.

[4] As of the 2010 census,[10] the population density was 17.6 people per square mile (6.8 people/km2).

[11] The racial makeup of the county was 88.9% White, 0.6% Black or African American, 1.5% Native American, 1.5% Asian, 0.2% Pacific Islander, 3.5% from other races, 3.7% two or more races.

[10] In terms of ancestry, 24.6% were German, 14.2% were Irish, 13.7% were English, 6.4% were Norwegian, and 6.1% were American.

The racial makeup of the county was 90.05% White, 0.28% Black or African American, 5.66% Native American, 0.48% Asian, 0.16% Pacific Islander, 0.68% from other races, and 2.70% from two or more races.

20.6% were of German, 18.9% United States or American, 10.0% English, 7.9% Irish and 5.0% Norwegian ancestry.