Cottonwood is a city in Idaho County, Idaho. On the Camas Prairie in north central Idaho, the population was 822 at the 2020 census, down from 900 in 2010 and 944 in 2000. It is just west of U.S. Route 95, between Grangeville and Lewiston.

Idaho County is a county in the U.S. state of Idaho, and the largest by area in the state. As of the 2020 census, the population was 16,541. The county seat is Grangeville. Previous county seats of the area were Florence (1864–68), Washington (1868–75), and Mount Idaho (1875–1902).