Benewah County is a county located in the northwest part of the U.S. state of Idaho. As of the 2020 United States Census the county had a population of 9,530. The county seat and largest city is St. Maries, which has some area inside the Coeur d'Alene Reservation.

Spokane County is a county located in the U.S. state of Washington. As of the 2020 census, its population was 539,339, making it the fourth-most populous county in Washington. The largest city and county seat is Spokane, the second largest city in the state after Seattle. The county is named after the Spokane tribe.