Lost River is located in Custer County. About 42 people live here (as of 2020). Between 2010 and 2020, the population declined from 68 to 42. There are about 5 streets in Lost River. The dialing code is 208. Lost River is city in Custer County, Idaho, United States.
| Area | 8.7 |
| Located in | Custer County |
| Country | United States |
| Population | 42 |
| Official name | Lost River |
| Bike path |
| Bike lane on roadway |
| Cycling allowed on bus lane |
| Bicycle street |
| Open to cyclists |
| Open to cyclists, good path |
| Cycling prohibited |
| Cobblestone |
| Long-distance bike route | (depending on scale) |
| Long-distance bike route |
| Long-distance hiking trail | (depending on scale) |
| Long-distance hiking trail |
| Pedestrians prohibited |
Public transit map Lost River Legend 
Bicycle map Lost River Legend 
Pedestrian map Lost River Legend