Petroleum County's estimated 2025 population is 620 with a growth rate of 5.62% in the past year according to the most recent United States census data. Petroleum County is the 56th largest county in Montana. The 2010 population was 489 and has seen a growth of 26.79% since that time.
Data after 2023 is projected based on recent change
The racial composition of Petroleum County includes 99.25% White, and smaller percentages for Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander, other race, Two or more races and multiracial populations.
White
Asian
Black or African American
Native American
Native Hawaiian or Pacific Islander
Other race
Two or more races
Race | Population | Percentage (of total) |
|---|---|---|
| White | 398 | 99.25% |
| Asian | 3 | 0.75% |
| Black or African American | 0 | 0% |
| Native American | 0 | 0% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
| Other race | 0 | 0% |
| Two or more races | 0 | 0% |
Married
Widowed
Divorced
Separated
Never Married
Petroleum County's average per capita income is $40,000. Household income levels show a median of $59,318. The poverty rate stands at 6.48%.
Name | Median | Mean |
|---|---|---|
| Married Families | $81,875 | - |
| Families | $78,750 | $90,634 |
| Households | $59,318 | $79,305 |
| Non Families | $33,750 | $59,164 |
Average Income
Median Household Income
Poverty Rate
