Demographics of Lemhi County, Idaho

Lemhi County, Idaho had 8,474 people on July 1, 2025, by the Census Bureau’s estimate: +519 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Lemhi County, in four figures

8,474
Population: July 1, 2025, Vintage 2025 estimate.; +6.5%
Change since July 2020: +519 people.; 53.3 ±1.0
Median age: ACS 2020–⁠2024.; $53,202 ±$4,428
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Lemhi County, Idaho's population grew 6.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Lemhi County, Idaho's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Lemhi County, Idaho's population grew 6.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Lemhi County, Idaho's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	7,955	100.0	100.0
2021	8,160	102.6	100.2
2022	8,285	104.1	100.7
2023	8,458	106.3	101.6
2024	8,408	105.7	102.5
2025	8,474	106.5	103.1

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Population of Lemhi County, Idaho on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	7,955	−17	−23	0	+5
2021	8,160	+205	−61	+1	+283
2022	8,285	+125	−81	0	+199
2023	8,458	+173	−51	+6	+217
2024	8,408	−50	−49	+3	−1
2025	8,474	+66	−50	−1	+119

Age, 2020–2024

The median age is 53.3 ±1.0: for men 52.9 ±2.2 and for women 53.4 ±0.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Lemhi County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	333 ±119	4.0% ±1.4	5.9% ±<0.1	5.6% ±<0.1
5 to 17	1,066 ±120	12.9% ±1.5	18.2% ±0.2	16.3% ±<0.1
18 to 24	711 ±215	8.6% ±2.6	9.8% ±0.1	9.1% ±<0.1
25 to 44	1,430 ±200	17.3% ±2.4	26.1% ±0.2	26.9% ±<0.1
45 to 64	2,159 ±250	26.2% ±3.0	23.0% ±0.2	24.8% ±<0.1
65 and over	2,550 ±283	30.9% ±3.4	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $53,202 ±$4,428, and income per person $34,545 ±$3,796, in 2024 dollars. The median is $77,800 ±$743 in Idaho and $80,734 ±$166 in the United States.

Households by income

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Households in Lemhi County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	984 ±250	28.5% ±7.1	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	571 ±159	16.5% ±4.5	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	723 ±166	20.9% ±4.7	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	362 ±125	10.5% ±3.6	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	463 ±122	13.4% ±3.5	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	204 ±70	5.9% ±2.0	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	151 ±62	4.4% ±1.8	9.2% ±0.3	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Lemhi County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	1,046 ±253	12.8% ±3.1	10.6% ±0.3	12.5% ±0.1
Under 18	59 to 175	8.4% ±4.1	12.4% ±0.5	16.1% ±0.1
18 to 59	421 ±146	12.3% ±4.2	10.4% ±0.3	11.6% ±0.1
60 and over	508 ±180	15.3% ±5.2	9.1% ±0.4	11.0% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Housing, 2020–2024

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Housing in Lemhi County, ACS 2020–2024
Measure	Lemhi County	Idaho	United States
Housing units	4,676 ±16	795,014 ±223	143,775,355 ±10,234
Occupied	74.0% ±3.9	89.7% ±0.3	89.9% ±0.1
Vacant	26.0% ±3.9	10.3% ±0.3	10.1% ±0.1
Owner occupied	79.3% ±4.8	72.1% ±0.4	65.2% ±0.3
Renter occupied	20.7% ±5.3	27.9% ±0.4	34.8% ±0.1
Median home value	$326,100 ±$31,635	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$754 ±$186	$1,238 ±$16	$1,413 ±$2
Median year built	1979 ±2	1991 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Lemhi County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	324 ±0	3.9% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	7,544 ±87	91.5% ±1.1	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 21	0% to 0.3%	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 8	0% to 0.1%	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	2 to 66	< 0.1% to 0.8%	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 24	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 94	0% to 1.1%	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	286 ±78	3.5% ±0.9	4.2% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Lemhi County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	3,301 ±359	40.0% ±4.4	43.9% ±0.3	57.3% ±<0.1
Born in another state	4,867 ±362	59.0% ±4.4	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	0 to 68	0% to 0.8%	1.0% ±0.1	1.7% ±<0.1
Born abroad	14 to 82	0.2% to 1.0%	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	0 to 42	0% to 0.5%	2.7% ±0.1	7.4% ±<0.1
Not citizens	7 to 47	0.1% to 0.6%	3.2% ±0.2	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Lemhi County among the counties of Idaho

33rd of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Lemhi County in population, July 2025
County	July 2025	Change since 2020
Owyhee County	12,661	+5.6%
Washington County	11,583	+9.7%
Benewah County	10,508	+9.7%
Clearwater County	9,118	+4.1%
Boise County	8,545	+11.5%
Lemhi County	8,474	+6.5%
Power County	8,246	+4.6%
Caribou County	7,252	+3.4%
Bear Lake County	6,727	+5.7%
Lincoln County	5,603	+9.1%
Oneida County	5,085	+11.4%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026