Yellowstone County, Montana
Located in Montana, Yellowstone County has a population of 168,957 residents and a median age of 39.0 years, making it the #408 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.2%. The median home value is $349,500, and the median household income is $76,570, which is 2% above the national median.
Demographics
Yellowstone County has a population of 168,957, making it the #408 most populous county in the US. The median age is 39.0 years, which is 0.3% above 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 Yellowstone County is $76,570, ranking #744 out of 3,222 counties — 1.9% above the national median. The poverty rate is 9.2% and unemployment stands at 3.4%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Yellowstone County is $349,500 (+24.0% vs national). Renters pay a median of $1,131/mo and the homeownership rate is 69.6%.
Median Home Value Trend
Rankings →Household Type
Education
In Yellowstone County, 34.1% of adults age 25+ hold a bachelor's degree or higher, which is 1.3% above the national average, ranking #514 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Yellowstone County is 75.9 years. 16.0% of adults report poor or fair health and 9.2% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
17.4% of adults in Yellowstone County smoke , 34.6% are obese , and 24.9% report excessive drinking. The drug overdose death rate is 24.2 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Yellowstone County is 4.7 per 100,000 and the suicide rate is 26.4 per 100,000. Motor vehicle deaths occur at a rate of 14.8 per 100,000.
Homicide Rate Trend
Families & Children
10.4% of children in Yellowstone County live in poverty and the infant mortality rate is 5.5 per 1,000 live births. The teen birth rate is 15.3 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Yellowstone County is 69.0%. The mean commute time is 20.5 min, which is 25.8% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Yellowstone County voted Republican with a margin of 27.1%. The vote was 34.9% Dem / 62% Rep. Compared to 2020, the margin shifted 3.1 toward Republicans .
Vote Share Over Time
About Yellowstone County, Montana
Yellowstone County, Montana has a total population of 168,957, making it the 408th most populous county in the United States. The median age in Yellowstone County is 39.0 years, which is 0.3% above the national median of 38.9 years.
The median household income in Yellowstone County is $76,570, which ranks #744 of 3,222 counties nationwide. This is 1.9% above the national median of $75,149. The poverty rate is 9.2%, lower than the national rate of 12.6%. The unemployment rate stands at 3.4%.
The median home value in Yellowstone County is $349,500, 24.0% above the national median. Renters in Yellowstone County pay a median gross rent of $1,131 per month. The homeownership rate is 69.6%, compared to the national rate of 64.4%.
In Yellowstone County, 34.1% of residents aged 25 and older hold a bachelor's degree or higher, 1.3% above the national average of 33.7%. Health insurance coverage stands at 92.3% of the population. The average commute time for workers is 20.5 min.
Yellowstone County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 83.4% of the population, followed by Hispanic or Latino (6.6%) and Two or More Races (4.7%).
All data for Yellowstone 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.