Big Horn County Demographics

A map of Big Horn County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
Native American/Other	8,534	8,639	66.2%	65.8%
White	3,476	3,407	27.0%	26.0%
Hispanic	610	515	4.7%	3.9%
Multiracial	212	508	1.6%	3.9%
Black	34	11	0.3%	0.1%
Asian	25	44	0.2%	0.3%

Big Horn County, Montana has an estimated population of 12,891, a slight decrease from the 13,124 recorded in the 2020 Census. The population is 66.2% Native American/Other, 27.0% White, 4.7% Hispanic, 1.6% Multiracial, 0.3% Black, and 0.2% Asian. This demographic dot map shows the population of Big Horn County, with one dot drawn for each person counted by the Census, color-coded by race.

Big Horn has become slightly less racially diverse since the 2020 Census. It is considerably more diverse than Montana overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Big Horn County, that probability was 49.6% in 2020 and 48.6% in the most recent ACS estimates.

Big Horn County is ranked the 15th most populous county in Montana, out of 56 counties. Big Horn County was ranked the 14th most populous county in the 2020 Census.

Big Horn County's White Population

3,476 residents of Big Horn County, or 27.0% of the population, identify as White. The share of White residents in Big Horn County is significantly lower than in Montana overall, where 83.6% of the population is White. Big Horn County ranks 55th statewide in terms of White residents as a share of the population, out of 56 counties.

Since the 2020 Census, Big Horn County's White population has grown by an estimated 2.0%. White residents' share of Big Horn County's population has increased from 26.0% to 27.0%.

Big Horn County is less White than neighboring Treasure County (93% White), Sheridan County (89.2% White), Yellowstone County (83.4% White), Big Horn County (85% White), and Rosebud County (51.4% White).

Big Horn County's Black Population

34 residents of Big Horn County, or 0.3% of the population, identify as Black. The share of Black residents in Big Horn County is comparable to the share in Montana overall, where 0.4% of the population is Black. Big Horn County ranks 49th statewide in terms of Black residents as a share of the population, out of 56 counties.

Since the 2020 Census, Big Horn County's Black population has grown by an estimated 209.1%. Black residents' share of Big Horn County's population has remained roughly unchanged at 0.3%.

Big Horn County is more Black than neighboring Treasure County (0% Black), and Rosebud County (0.1% Black). Big Horn County is less Black than neighboring Sheridan County (0.7% Black), Yellowstone County (0.4% Black), and Big Horn County (0.7% Black).

Big Horn County's Asian Population

25 residents of Big Horn County, or 0.2% of the population, identify as Asian. The share of Asian residents in Big Horn County is comparable to the share in Montana overall, where 0.8% of the population is Asian. Big Horn County ranks 34th statewide in terms of Asian residents as a share of the population, out of 56 counties.

Since the 2020 Census, Big Horn County's Asian population has declined by an estimated 43.2%. Asian residents' share of Big Horn County's population has remained roughly unchanged at 0.2%.

Big Horn County is less Asian than neighboring Treasure County (1% Asian), Sheridan County (1% Asian), Yellowstone County (0.7% Asian), Big Horn County (0.5% Asian), and Rosebud County (2% Asian).

Big Horn County's Hispanic Population

610 residents of Big Horn County, or 4.7% of the population, identify as Hispanic. The share of Hispanic residents in Big Horn County is comparable to the share in Montana overall, where 4.6% of the population is Hispanic. Big Horn County ranks 10th statewide in terms of Hispanic residents as a share of the population, out of 56 counties.

Since the 2020 Census, Big Horn County's Hispanic population has grown by an estimated 18.4%. Hispanic residents' share of Big Horn County's population has increased from 3.9% to 4.7%.

Big Horn County is more Hispanic than neighboring Rosebud County (3.7% Hispanic). Big Horn County is less Hispanic than neighboring Treasure County (5.2% Hispanic), Sheridan County (5% Hispanic), Yellowstone County (6.6% Hispanic), and Big Horn County (9.7% Hispanic).

Big Horn County's Native American/Other Population

8,534 residents of Big Horn County, or 66.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Big Horn County is significantly higher than in Montana overall, where 5.9% of the population is Native American/Other. Big Horn County ranks 2nd statewide in terms of Native American/Other residents as a share of the population, out of 56 counties.

Since the 2020 Census, Big Horn County's Native American/Other population has declined by an estimated 1.2%. Native American/Other residents' share of Big Horn County's population has remained roughly unchanged at 66.2%.

Big Horn County is more Native American/Other than neighboring Treasure County (0.1% Native American/Other), Sheridan County (1.2% Native American/Other), Yellowstone County (4.1% Native American/Other), Big Horn County (1.1% Native American/Other), and Rosebud County (38% Native American/Other).

Big Horn County's Multiracial Population

212 residents of Big Horn County, or 1.6% of the population, identify as Multiracial. The share of Multiracial residents in Big Horn County is slightly lower than in Montana overall, where 4.7% of the population is Multiracial. Big Horn County ranks 37th statewide in terms of Multiracial residents as a share of the population, out of 56 counties.

Since the 2020 Census, Big Horn County's Multiracial population has declined by an estimated 58.3%. Multiracial residents' share of Big Horn County's population has decreased from 3.9% to 1.6%.

Big Horn County is more Multiracial than neighboring Treasure County (0.7% Multiracial). Big Horn County is less Multiracial than neighboring Sheridan County (3% Multiracial), Yellowstone County (4.7% Multiracial), Big Horn County (3.1% Multiracial), and Rosebud County (4.8% 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.