Lemhi County Demographics

A map of Lemhi County's Population by Race

Lemhi County, Idaho has an estimated population of 8,249, an increase from the 7,974 recorded in the 2020 Census. The population is 91.5% White, 3.9% Hispanic, 3.5% Multiracial, 1.0% Native American/Other, 0.1% Black, and 0.0% Asian. This demographic dot map shows the population of Lemhi County, with one dot drawn for each person counted by the Census, color-coded by race.

Lemhi is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Idaho overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Lemhi County, that probability was 16.4% in 2020 and 16.1% in the most recent ACS estimates.

Lemhi County is ranked the 33rd most populous county in Idaho, out of 44 counties. Lemhi County was ranked the 32nd most populous county in the 2020 Census.

Lemhi County's White Population

7,544 residents of Lemhi County, or 91.5% of the population, identify as White. The share of White residents in Lemhi County is considerably higher than in Idaho overall, where 78.6% of the population is White. Lemhi County ranks 3rd statewide in terms of White residents as a share of the population, out of 44 counties.

Since the 2020 Census, Lemhi County's White population has grown by an estimated 3.6%. White residents' share of Lemhi County's population has remained roughly unchanged at 91.5%.

Lemhi County is more White than neighboring Custer County (88.4% White), Beaverhead County (89.1% White), Ravalli County (88.6% White), Deer Lodge County (89.3% White), and Butte County (88.7% White).

Lemhi County's Black Population

8 residents of Lemhi County, or 0.1% of the population, identify as Black. The share of Black residents in Lemhi County is comparable to the share in Idaho overall, where 0.7% of the population is Black. Lemhi County ranks 22nd statewide in terms of Black residents as a share of the population, out of 44 counties.

Since the 2020 Census, Lemhi County's Black population has declined by an estimated 52.9%. Black residents' share of Lemhi County's population has remained roughly unchanged at 0.1%.

Lemhi County is more Black than neighboring Butte County (0% Black). Lemhi County is less Black than neighboring Custer County (0.3% Black), Beaverhead County (0.5% Black), Ravalli County (0.3% Black), and Deer Lodge County (0.4% Black).

Lemhi County's Asian Population

3 residents of Lemhi County, or 0.0% of the population, identify as Asian. The share of Asian residents in Lemhi County is comparable to the share in Idaho overall, where 1.3% of the population is Asian. Lemhi County ranks 27th statewide in terms of Asian residents as a share of the population, out of 44 counties.

Since the 2020 Census, Lemhi County's Asian population has declined by an estimated 89.3%. Asian residents' share of Lemhi County's population has remained roughly unchanged at 0.0%.

Lemhi County is less Asian than neighboring Custer County (3.1% Asian), Beaverhead County (0.3% Asian), Ravalli County (0.7% Asian), and Deer Lodge County (0.2% Asian).

Lemhi County's Hispanic Population

324 residents of Lemhi County, or 3.9% of the population, identify as Hispanic. The share of Hispanic residents in Lemhi County is lower than in Idaho overall, where 13.6% of the population is Hispanic. Lemhi County ranks 36th statewide in terms of Hispanic residents as a share of the population, out of 44 counties.

Since the 2020 Census, Lemhi County's Hispanic population has grown by an estimated 9.8%. Hispanic residents' share of Lemhi County's population has remained roughly unchanged at 3.9%.

Lemhi County is more Hispanic than neighboring Deer Lodge County (3.5% Hispanic). Lemhi County is less Hispanic than neighboring Custer County (4.5% Hispanic), Beaverhead County (5.2% Hispanic), Ravalli County (4.1% Hispanic), and Butte County (6.4% Hispanic).

Lemhi County's Native American/Other Population

84 residents of Lemhi County, or 1.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Lemhi County is comparable to the share in Idaho overall, where 1.5% of the population is Native American/Other. Lemhi County ranks 24th statewide in terms of Native American/Other residents as a share of the population, out of 44 counties.

Since the 2020 Census, Lemhi County's Native American/Other population has declined by an estimated 6.7%. Native American/Other residents' share of Lemhi County's population has remained roughly unchanged at 1.0%.

Lemhi County is more Native American/Other than neighboring Custer County (0.7% Native American/Other), and Butte County (0.3% Native American/Other). Lemhi County is less Native American/Other than neighboring Beaverhead County (1.4% Native American/Other), Ravalli County (1.5% Native American/Other), and Deer Lodge County (2.2% Native American/Other).

Lemhi County's Multiracial Population

286 residents of Lemhi County, or 3.5% of the population, identify as Multiracial. The share of Multiracial residents in Lemhi County is comparable to the share in Idaho overall, where 4.2% of the population is Multiracial. Lemhi County ranks 29th statewide in terms of Multiracial residents as a share of the population, out of 44 counties.

Since the 2020 Census, Lemhi County's Multiracial population has grown by an estimated 8.3%. Multiracial residents' share of Lemhi County's population has remained roughly unchanged at 3.5%.

Lemhi County is more Multiracial than neighboring Custer County (3% Multiracial). Lemhi County is less Multiracial than neighboring Ravalli County (4.8% Multiracial), Deer Lodge County (4.4% Multiracial), and Butte County (4.5% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.