Lemhi County, Idaho Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 32nd-largest in Idaho
The population of Lemhi County, Idaho is 8,166 as of the 2023 American Community Survey, making it the 32nd-largest county in Idaho. The median household income is $52,057, the median home value is $282,100, and the median age is 53.1.
The population of Lemhi County has grown 5.6% since 2010 (7,952 → 8,397), a +0.39% annualized rate.
8,166
Population
+0.39%
Annual growth
2
People / sq mi
$52,057
Median Income
$282,100
Median Home Value
Lemhi County covers 4,564 sq mi of land at 1.8 people per square mile.
About Lemhi County, ID
Lemhi County is distinguished by its share of foreign-born residents, 59.4% of the population. With 8,166 residents, Lemhi County is a county in Idaho. It ranks #32 among counties in Idaho by population.
Incomes run on the lower side: a median household income of $52,057, below the US median of $78,538. Poverty runs at 9.4%, below the national 12.4%. The median home value is $282,100, with typical rent around $721.
Roughly 22.9% of adults have a bachelor’s, below the national 35.0%. Remote work is below the national 14.0% at 9.7%, and the average commute runs about 15 minutes each way.
The large foreign-born share is a defining thread in Lemhi County, shaping language, household composition, and the labor force behind the economic figures above.
Lemhi County Population History (2010-2024)
The county of Lemhi County had a population of 7,952 in 2010 and 8,397 in 2024, a 5.6% growth over 14 years. The peak was 8,447 in 2023. Average annual growth rate: 0.40%.
8,397
Population (2024)
7,952
Population (2010)
8,447
Peak (2023)
0.40%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 7,952 |
| 2011 | 7,985 |
| 2012 | 7,769 |
| 2013 | 7,718 |
| 2014 | 7,728 |
| 2015 | 7,744 |
| 2016 | 7,715 |
| 2017 | 7,837 |
| 2018 | 7,974 |
| 2019 | 8,067 |
| 2020 | 7,958 |
| 2021 | 8,158 |
| 2022 | 8,286 |
| 2023 | 8,447 |
| 2024 | 8,397 |
Race & Ethnicity
| White | 92.1% |
| Black or African American | 0.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 4.4% |
| Two or More Races | 0.0% |
Age & Sex
53.1
Median Age
49.2%
Female
50.8%
Male
30.4%
Age 65+
Age Distribution
Children (under 15): 14.8% · Seniors (65+): 30.4%
Income & Poverty
| Median household income | $52,057$-22,579 vs state |
| Mean household income | $72,897 |
| Per-capita income | $33,896 |
| Poverty rate | 9.4%+2.4% vs state |
| Unemployment rate | 1.8% |
| Employment-to-population | 51.2% |
Top Industries by Employment
The largest employment sector in Lemhi County is professional & business services, accounting for 16.3% of workers.
How residents commute
0.0%
Drive alone
7.7%
Carpool
68.7%
Public transit
9.7%
Work from home
14.8 min
Avg commute
Housing
$282,100$-93,900 vs state
Median home value
$721
Median rent
81.3%
Homeownership rate
4,636
Total housing units
72.3%
Occupied
27.7%
Vacant
18.7%
Renter-occupied
Social & access
93.2%
With health insurance
90.4%
With broadband internet
59.4%
Foreign-born
10.3%
Veterans (18+)
22.2%
With a disability
98.3%
Speak language other than English at home
Education
92.7%
High School+
22.9%
Bachelor's+
Largest cities in Idaho
Other counties in Idaho
Part of Idaho
Metro areas in Idaho
County rankings
Frequently Asked Questions
Lemhi County, Idaho has a population of 8,166 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 32nd-largest county in Idaho. Population density is 2 people per square mile.
The population of Lemhi County has grown 5.6% since 2010 (7,952 → 8,397), a +0.39% annualized rate.
The median household income in Lemhi County, Idaho is $52,057, with mean (average) household income of $72,897 and per-capita income of $33,896. 9.4% of residents live below the federal poverty level.
In Lemhi County, the largest racial and ethnic groups are White (92.1%), Hispanic or Latino (4.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Lemhi County, Idaho is 53.1 years. Residents are 49.2% female and 50.8% male.
The median home value in Lemhi County is $282,100 and median monthly rent is $721. 81.3% of occupied housing units are owner-occupied. The county has 4,636 total housing units, 27.7% of which are vacant.
The largest employment sector in Lemhi County, Idaho is professional, scientific, and management services, employing 16.3% of workers. The unemployment rate is 1.8%.
Boise City is among the largest cities associated with Lemhi County, Idaho, with a population of 235,701.
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Statewide data for Idaho
Population, race, income, age, and trends across Idaho
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.