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.

St. Maries is a city in north central Idaho, the largest in rural Benewah County and its county seat. Its population was 2,402 at the 2010 census, down from 2,652 in 2000.