Gallatin County, Montana
Located in Montana, Gallatin County has a population of 124,074 residents and a median age of 34.2 years, making it the #527 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.5%. The median home value is $667,600, and the median household income is $93,528, which is 24% above the national median.
Demographics
Gallatin County has a population of 124,074, making it the #527 most populous county in the US. The median age is 34.2 years, which is 12.1% below the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Gallatin County is $93,528, ranking #241 out of 3,222 counties — 24.5% above the national median. The poverty rate is 9.5% and unemployment stands at 2.3%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Gallatin County is $667,600 (+136.8% vs national). Renters pay a median of $1,694/mo and the homeownership rate is 61.1%.
Median Home Value Trend
Rankings →Household Type
Education
In Gallatin County, 54.3% of adults age 25+ hold a bachelor's degree or higher, which is 61.1% above the national average, ranking #57 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Gallatin County is 82.0 years. 12.7% of adults report poor or fair health and 8.0% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
12.3% of adults in Gallatin County smoke , 23.7% are obese , and 27.3% report excessive drinking. The drug overdose death rate is 7.1 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Gallatin County is 1.9 per 100,000 and the suicide rate is 21.0 per 100,000. Motor vehicle deaths occur at a rate of 9.8 per 100,000.
Homicide Rate Trend
Families & Children
5.8% of children in Gallatin County live in poverty and the infant mortality rate is 3.4 per 1,000 live births. The teen birth rate is 5.5 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Gallatin County is 81.0%. The mean commute time is 20.6 min, which is 25.2% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Gallatin County voted Democratic with a margin of 3.2%. The vote was 50% Dem / 46.8% Rep. Compared to 2020, the margin shifted 4.3 toward Republicans .
Vote Share Over Time
About Gallatin County, Montana
Gallatin County, Montana has a total population of 124,074, making it the 527th most populous county in the United States. The median age in Gallatin County is 34.2 years, which is 12.1% below the national median of 38.9 years.
The median household income in Gallatin County is $93,528, which ranks #241 of 3,222 counties nationwide. This is 24.5% above the national median of $75,149. The poverty rate is 9.5%, lower than the national rate of 12.6%. The unemployment rate stands at 2.3%.
The median home value in Gallatin County is $667,600, 136.8% above the national median. Renters in Gallatin County pay a median gross rent of $1,694 per month. The homeownership rate is 61.1%, compared to the national rate of 64.4%.
In Gallatin County, 54.3% of residents aged 25 and older hold a bachelor's degree or higher, 61.1% above the national average of 33.7%. Health insurance coverage stands at 93.1% of the population. The average commute time for workers is 20.6 min.
Gallatin County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 87.5% of the population, followed by Hispanic or Latino (5.4%) and Two or More Races (4.0%).
All data for Gallatin County, Montana comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.