Petroleum County, Montana

Petroleum County, Montana, had an estimated population of 548 in 2025 across 4,288 km². The figures below come from the US Census Bureau's population estimates and the American Community Survey, each shown with its own vintage and its rank among Montana's counties and nationally.

Population: 548; 2025 estimate
Area: 4,288 km²
Density: 0; per km²
Median income: $60,208; household, ACS 2024
Median age: 51.6; years, ACS 2024

How Montana's counties spread

Amenities & Infrastructure

Indicator	Value	In Montana	In the US
Households with Broadband2024	84.2%	35 / 56	2,197 / 3,144
Median Gross Rent2024	$800	31 / 56	2,089 / 3,137
Median Home Value2024	$201,400	39 / 56	1,387 / 3,139
Owner-Occupied Homes2024	72.9%	25 / 56	1,843 / 3,144
Vacant Homes2024	28.9%	7 / 56	321 / 3,144

Demography

Indicator	Value	In Montana	In the US
Aged 65 and Over2024	28.2%	14 / 56	213 / 3,144
American Indian & Alaska Native2024	0.4%	48 / 56	768 / 3,144
Asian, non-Hispanic2024	0.7%	16 / 56	1,366 / 3,144
Average Household Size2024people	2	54 / 56	3,073 / 3,144
Black, non-Hispanic2024	0.0%	41 / 56	3,009 / 3,144
Foreign-Born2024	0.9%	45 / 56	2,727 / 3,144
Hispanic or Latino2024	0.0%	55 / 56	3,132 / 3,144
Median Age2024years	51.6	11 / 56	148 / 3,144
Sex Ratio2024per 1,000 males	810	53 / 56	3,006 / 3,144
Speak a Language Other Than English2024	0.0%	55 / 56	3,140 / 3,144
Under 182024	14.8%	52 / 56	3,055 / 3,144
Veterans2024	16.3%	1 / 56	27 / 3,144
White, non-Hispanic2024	98.9%	1 / 56	3 / 3,144

Economy

Indicator	Value	In Montana	In the US
Below Poverty Line2024	8.1%	47 / 56	2,757 / 3,144
Households on SNAP2024	0.5%	55 / 56	3,135 / 3,144
Income Inequality2024index	0.427	43 / 56	2,254 / 3,144
Median Household Income2024	$60,208	35 / 56	2,060 / 3,143
Per Capita Income2024	$39,919	18 / 56	835 / 3,144
Unemployment Rate2024	0.0%	54 / 56	3,123 / 3,144

Education

Indicator	Value	In Montana	In the US
Bachelor's Degree or Higher2024	30.8%	16 / 56	702 / 3,144
High School or Higher2024	98.9%	2 / 56	5 / 3,144

Health Coverage

Indicator	Value	In Montana	In the US
No Health Insurance2024	6.7%	35 / 56	1,899 / 3,144
With a Disability2024	6.7%	56 / 56	3,136 / 3,144

Population & Density

Indicator	Value	In Montana	In the US
Population2025	548	56 / 56	3,136 / 3,144
Population Density2025/km²	0	44 / 56	3,045 / 3,144

Work & Commute

Indicator	Value	In Montana	In the US
Commute by Public Transit2024	0.0%	38 / 56	2,161 / 3,144
Households with No Vehicle2024	0.0%	56 / 56	3,135 / 3,144
Mean Commute Time2024minutes	16.2	46 / 56	2,920 / 3,143
Work from Home2024	15.3%	23 / 56	393 / 3,144

Other counties of Montana

Compare Petroleum County against every other county on a map, add layers and run a scatter — open the atlas. Sources and vintages for every figure on this page are listed under datasets, or browse all 3,144 counties.