Petroleum County, Montana
Located in Montana, Petroleum County has a population of 447 residents and a median age of 51.6 years, making it the #3,217 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 8.1%. The median home value is $201,400, and the median household income is $60,208, which is 20% below the national median.
Demographics
Petroleum County has a population of 447, making it the #3,217 most populous county in the US. The median age is 51.6 years, which is 32.6% 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 Petroleum County is $60,208, ranking #2,060 out of 3,222 counties — 19.9% below the national median. The poverty rate is 8.1% and unemployment stands at 0.0%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Petroleum County is $201,400 (-28.6% vs national). Renters pay a median of $800/mo and the homeownership rate is 72.9%.
Median Home Value Trend
Rankings →Household Type
Education
In Petroleum County, 30.8% of adults age 25+ hold a bachelor's degree or higher, which is 8.6% below the national average, ranking #715 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
15.2% of adults report poor or fair health and 6.3% lack health insurance. Data from County Health Rankings (2025).
Poor/Fair Health Trend
Substance Use
16.3% of adults in Petroleum County smoke , 32.8% are obese , and 24.8% report excessive drinking.
Adult Smoking Trend
Safety
.
Families & Children
19.2% of children in Petroleum County live in poverty .
Child Poverty Trend
Civic & Transportation
Voter turnout in Petroleum County is 91.6%. The mean commute time is 19.0 min, which is 31.2% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Petroleum County voted Republican with a margin of 76.3%. The vote was 11.4% Dem / 87.7% Rep. Compared to 2020, the margin shifted 2.5 toward Republicans .
Vote Share Over Time
About Petroleum County, Montana
Petroleum County, Montana has a total population of 447, making it the 3,217th most populous county in the United States. The median age in Petroleum County is 51.6 years, which is 32.6% above the national median of 38.9 years.
The median household income in Petroleum County is $60,208, which ranks #2,060 of 3,222 counties nationwide. This is 19.9% below the national median of $75,149. The poverty rate is 8.1%, lower than the national rate of 12.6%.
The median home value in Petroleum County is $201,400, 28.6% below the national median. Renters in Petroleum County pay a median gross rent of $800 per month. The homeownership rate is 72.9%, compared to the national rate of 64.4%.
In Petroleum County, 30.8% of residents aged 25 and older hold a bachelor's degree or higher, 8.6% below the national average of 33.7%. Health insurance coverage stands at 93.3% of the population. The average commute time for workers is 19.0 min.
Petroleum County is a community. The largest racial or ethnic group is White (non-Hispanic) at 98.9% of the population.
All data for Petroleum 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.