Lost River, Idaho

Lost River is a city in Custer County, Idaho, United States. It had 42 residents at the 2020 census. Geography Lost River is located at 43°43′18″N 113°32′42″W (43.721785, -113.544931). According to the United States Census Bureau, the city has a total area of 8.33 square miles (21.56 km2). 8.32 square miles (21.54 km2) of it is land and 0.01 square miles (0.02 km2) is water. It is named after the Big Lost River. References