Stevens County is a county located in the U.S. state of Washington along the Canada–US border. At the 2020 census, its population was 46,445. As of July 2023, the population was estimated to be 48,837. The county seat and largest city is Colville. The county was created in 1863 and named after Isaac Stevens, the first governor of Washington Territory. Stevens County is included in the Spokane-Spokane Valley, WA Metropolitan Statistical Area.