Lemhi County's 2026 population is estimated at 8,297, reflecting a -0.6% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Lemhi County is the 34th largest county in Idaho. The 2010 population was 7,952 and has grown 4.34% since 2010.
Data after 2023 is projected based on recent change
Overall: 53.3 years
Female: 53.4 years
Male: 52.9 years
There are 6,850 adults, (2,550 of whom are seniors) in Lemhi County.
Female: 4,052 (49.1%)
Male: 4,197 (50.9%)
The racial composition of Lemhi County includes 92.42% White, and smaller percentages for other race, Native American, Asian, Native Hawaiian or Pacific Islander, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 7,624 | 92.42% |
| Two or more races | 470 | 5.7% |
| Other race | 90 | 1.09% |
| Native American | 34 | 0.41% |
| Asian | 13 | 0.16% |
| Native Hawaiian or Pacific Islander | 10 | 0.12% |
| Black or African American | 8 | 0.1% |
Lemhi County 's average per capita income is $35,153. Household income levels show a median of $53,202. The poverty rate stands at 12.84%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $79,564 | - |
| Families | $74,429 | $90,349 |
| Households | $53,202 | $74,280 |
| Non Families | $26,230 | $49,196 |
Average Income
Median Household Income
Poverty Rate
