Crook County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 24,738. The county seat is Prineville. The county is named after George Crook, a U.S. Army officer who served in the American Civil War and various Indian Wars. Crook County comprises the Prineville, OR Micropolitan Statistical Area, which is included in the Bend—Prineville, OR Combined Statistical Area.