The name derives from the Okanagan language place name ukʷnaqín. The name Okanogan (Okanagan) also refers to the region that also encompasses part of southern British Columbia.
Okanogan County was formed out of Stevens County on February 2, 1888. (Wikipedia.org)
Today, Okanogan County is one of the best vacation spots in the United States, boasting the largest cross country ski trail system, scenic byways, tours, hikes, snowboarding, sledding, and fishing.