In 2022, Petroleum County, MT had a population of 416 people with a median age of 49.6 and a median household income of $57,981. Between 2021 and 2022 the population of Petroleum County, MT declined from 434 to 416, a −4.15% decrease and its median household income grew from $54,375 to $57,981, a 6.63% increase.
The 5 largest ethnic groups in Petroleum County, MT are White (Non-Hispanic) (98.1%), Asian (Non-Hispanic) (1.92%), 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 2022, the median property value in Petroleum County, MT was $152,600, and the homeownership rate was 70.4%.
Most people in Petroleum County, MT drove alone to work, and the average commute time was 16.5 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.