Checked
Lost River, ID
City in Custer County, Idaho.
Population
55
Land area
8.3sq mi
People per sq mi
7
ZIP codes
0
Lost River and its ZIP codes
Lost River at a glance
- Lost River is 72% less dense than Idaho as a whole.
Economy and federal money
Jobs, pay, income and spending are for Custer County. PPP loans are for Lost River.
Unemployment rate
3.3%
Aug 2026, -0.3 pts in a year
Average annual pay
$49,724
1,601 jobs, 2025
Income per person
$57,363
BEA, 2024
Federal spending
$47.9M
FY 2026, $11,205 per person
Environment and hazard risk
Lost River, ID, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: landslide
Storm events since 1996
334
Countywide, mostly heavy snow
Flood insurance policies
17
0.4% of homes, county
July high / Jan low
82° / 7°F
15.0 inches of rain a year
Cities near Lost River
| Name | Distance | Land area (sq mi) |
|---|---|---|
| MooreCity | 14 mi | 0.3 |
| MackayCity | 16 mi | 0.9 |
| ArcoCity | 17 mi | 1.1 |
| Butte CityCity | 20 mi | 0.2 |
Frequently asked questions
- What county is Lost River, ID in?
- Lost River is in Custer County, Idaho.
- What is the population of Lost River, ID?
- About 55 people live in Lost River, based on American Community Survey 5-year estimates.
- What cities are near Lost River?
- Nearby places include Moore (14 mi), Mackay (16 mi), Arco (17 mi), Butte City (20 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023