In 2023, Petroleum County, MT had a population of 401 people with a median age of 51.5 and a median household income of $59,318. Between 2022 and 2023 the population of Petroleum County, MT declined from 416 to 401, a −3.61% decrease and its median household income grew from $57,981 to $59,318, a 2.31% increase.
The 5 largest ethnic groups in Petroleum County, MT are White (Non-Hispanic) (99.3%), Asian (Non-Hispanic) (0.748%), White (Hispanic) (0%), Black or African American (Non-Hispanic) (0%), and Black or African American (Hispanic) (0%).
None of the households in Petroleum County, MT reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
100% of the residents in Petroleum County, MT are U.S. citizens.
In 2023, the median property value in Petroleum County, MT was $173,700, and the homeownership rate was 77%.
Most people in Petroleum County, MT drove alone to work, and the average commute time was 14.2 minutes. The average car ownership in Petroleum County, MT was 2 cars per household.
Petroleum County, MT borders Fergus County, MT, Garfield County, MT, Musselshell County, MT, Phillips County, MT, and Rosebud County, MT.