Lemhi County, Idaho
Located in Idaho, Lemhi County has a population of 8,249 residents and a median age of 53.3 years, making it the #2,633 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 12.8%. The median home value is $326,100, and the median household income is $53,202, which is 29% below the national median.
Demographics
Lemhi County has a population of 8,249, making it the #2,633 most populous county in the US. The median age is 53.3 years, which is 37.0% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Lemhi County is $53,202, ranking #2,584 out of 3,222 counties — 29.2% below the national median. The poverty rate is 12.8% and unemployment stands at 2.0%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Lemhi County is $326,100 (+15.7% vs national). Renters pay a median of $754/mo and the homeownership rate is 79.3%.
Median Home Value Trend
Rankings →Household Type
Education
In Lemhi County, 24.1% of adults age 25+ hold a bachelor's degree or higher, which is 28.6% below the national average, ranking #1,356 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Lemhi County is 75.3 years. 17.2% of adults report poor or fair health and 12.6% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.2% of adults in Lemhi County smoke , 32.9% are obese , and 19.5% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 29.3 per 100,000. Motor vehicle deaths occur at a rate of 30.3 per 100,000.
Suicide Rate Trend
Families & Children
17.0% of children in Lemhi County live in poverty . The teen birth rate is 16.1 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Lemhi County is 73.9%. The mean commute time is 17.3 min, which is 37.3% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Lemhi County voted Republican with a margin of 55.0%. The vote was 21.3% Dem / 76.3% Rep. Compared to 2020, the margin shifted 1.0 toward Republicans .
Vote Share Over Time
About Lemhi County, Idaho
Lemhi County, Idaho has a total population of 8,249, making it the 2,633rd most populous county in the United States. The median age in Lemhi County is 53.3 years, which is 37.0% above the national median of 38.9 years.
The median household income in Lemhi County is $53,202, which ranks #2,584 of 3,222 counties nationwide. This is 29.2% below the national median of $75,149. The poverty rate is 12.8%, higher than the national rate of 12.6%. The unemployment rate stands at 2.0%.
The median home value in Lemhi County is $326,100, 15.7% above the national median. Renters in Lemhi County pay a median gross rent of $754 per month. The homeownership rate is 79.3%, compared to the national rate of 64.4%.
In Lemhi County, 24.1% of residents aged 25 and older hold a bachelor's degree or higher, 28.6% below the national average of 33.7%. Health insurance coverage stands at 93.9% of the population. The average commute time for workers is 17.3 min.
Lemhi County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 91.5% of the population, followed by Hispanic or Latino (3.9%) and Two or More Races (3.5%).
All data for Lemhi County, Idaho comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.