Lost River, Idaho

Lost River is a city in Custer County, Idaho, United States. It had 68 residents at the 2010 census.

Geography
Lost River is located at 43.72167°N, -113.545°W (43.721785, -113.544931).

According to the United States Census Bureau, the city has a total area of 8.70 sqmi. 8.69 sqmi of it is land and 0.01 sqmi is water.

Its named after the Big Lost River.