Gallatin County Demographics

A map of Gallatin County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	108,625	104,003	87.5%	87.4%
Hispanic	6,658	5,895	5.4%	5.0%
Multiracial	5,004	5,618	4.0%	4.7%
Native American/Other	1,692	1,562	1.4%	1.3%
Asian	1,540	1,389	1.2%	1.2%
Black	555	493	0.4%	0.4%

Gallatin County, Montana has an estimated population of 124,074, an increase from the 118,960 recorded in the 2020 Census. The population is 87.5% White, 5.4% Hispanic, 4.0% Multiracial, 1.4% Native American/Other, 1.2% Asian, and 0.4% Black. This demographic dot map shows the population of Gallatin County, with one dot drawn for each person counted by the Census, color-coded by race.

Gallatin is about as racially diverse as it was in the 2020 Census. It is considerably less 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 Gallatin County, that probability was 23.1% in 2020 and 22.9% in the most recent ACS estimates.

Gallatin County is ranked the 2nd most populous county in Montana, out of 56 counties. Gallatin County was ranked the 2nd most populous county in the 2020 Census.

Gallatin County's White Population

108,625 residents of Gallatin County, or 87.5% of the population, identify as White. The share of White residents in Gallatin County is slightly higher than in Montana overall, where 83.6% of the population is White. Gallatin County ranks 38th statewide in terms of White residents as a share of the population, out of 56 counties.

Since the 2020 Census, Gallatin County's White population has grown by an estimated 4.4%. White residents' share of Gallatin County's population has remained roughly unchanged at 87.5%.

Gallatin County is less White than neighboring Park County (90.9% White), Madison County (90.4% White), Broadwater County (88.9% White), Meagher County (94% White), and Jefferson County (90.6% White).

Gallatin County's Black Population

555 residents of Gallatin County, or 0.4% of the population, identify as Black. The share of Black residents in Gallatin County is comparable to the share in Montana overall, where 0.4% of the population is Black. Gallatin County ranks 11th statewide in terms of Black residents as a share of the population, out of 56 counties.

Since the 2020 Census, Gallatin County's Black population has grown by an estimated 12.6%. Black residents' share of Gallatin County's population has remained roughly unchanged at 0.4%.

Gallatin County is more Black than neighboring Park County (0.2% Black), Madison County (0% Black), Broadwater County (0.2% Black), and Jefferson County (0% Black). Gallatin County is less Black than neighboring Meagher County (0.7% Black).

Gallatin County's Asian Population

1,540 residents of Gallatin County, or 1.2% of the population, identify as Asian. The share of Asian residents in Gallatin County is comparable to the share in Montana overall, where 0.8% of the population is Asian. Gallatin County ranks 2nd statewide in terms of Asian residents as a share of the population, out of 56 counties.

Since the 2020 Census, Gallatin County's Asian population has grown by an estimated 10.9%. Asian residents' share of Gallatin County's population has remained roughly unchanged at 1.2%.

Gallatin County is more Asian than neighboring Park County (0.2% Asian), Madison County (0.5% Asian), Broadwater County (0.2% Asian), Meagher County (0% Asian), and Jefferson County (0.4% Asian).

Gallatin County's Hispanic Population

6,658 residents of Gallatin County, or 5.4% of the population, identify as Hispanic. The share of Hispanic residents in Gallatin County is comparable to the share in Montana overall, where 4.6% of the population is Hispanic. Gallatin County ranks 4th statewide in terms of Hispanic residents as a share of the population, out of 56 counties.

Since the 2020 Census, Gallatin County's Hispanic population has grown by an estimated 12.9%. Hispanic residents' share of Gallatin County's population has remained roughly unchanged at 5.4%.

Gallatin County is more Hispanic than neighboring Park County (3.6% Hispanic), Madison County (3.7% Hispanic), Broadwater County (2.8% Hispanic), Meagher County (3.2% Hispanic), and Jefferson County (3% Hispanic).

Gallatin County's Native American/Other Population

1,692 residents of Gallatin County, or 1.4% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Gallatin County is slightly lower than in Montana overall, where 5.9% of the population is Native American/Other. Gallatin County ranks 41st statewide in terms of Native American/Other residents as a share of the population, out of 56 counties.

Since the 2020 Census, Gallatin County's Native American/Other population has grown by an estimated 8.3%. Native American/Other residents' share of Gallatin County's population has remained roughly unchanged at 1.4%.

Gallatin County is more Native American/Other than neighboring Park County (0.6% Native American/Other), and Broadwater County (1.2% Native American/Other). Gallatin County is less Native American/Other than neighboring Madison County (2% Native American/Other), and Jefferson County (1.7% Native American/Other).

Gallatin County's Multiracial Population

5,004 residents of Gallatin County, or 4.0% of the population, identify as Multiracial. The share of Multiracial residents in Gallatin County is comparable to the share in Montana overall, where 4.7% of the population is Multiracial. Gallatin County ranks 26th statewide in terms of Multiracial residents as a share of the population, out of 56 counties.

Since the 2020 Census, Gallatin County's Multiracial population has declined by an estimated 10.9%. Multiracial residents' share of Gallatin County's population has decreased from 4.7% to 4.0%.

Gallatin County is more Multiracial than neighboring Madison County (3.5% Multiracial), and Meagher County (0.5% Multiracial). Gallatin County is less Multiracial than neighboring Park County (4.5% Multiracial), Broadwater County (6.7% Multiracial), and Jefferson County (4.4% 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.