Petroleum County, Montana

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Petroleum County is a county located in the U.S. state of Montana. As of 2000, the population was 493, making it Montana's least populous county. Its county seat is Winnett[1]. It was created in 1926 and is the newest of Montana's 56 counties.



According to the U.S. Census Bureau, the county has a total area of 1,674 square miles (4,336 km²), of which, 1,654 square miles (4,284 km²) of it is land and 20 square miles (52 km²) of it (1.20%) is water.

Major highways

Adjacent counties

National protected areas


As of the census[2] of 2000, there were 493 people, 211 households, and 136 families residing in the county. The population density was 0.29 people per square mile (0.11/km²). There were 292 housing units at an average density of 0.17 per square mile (0.07/km²). The racial makeup of the county was 99.19% White, 0.20% Native American, 0.20% from other races, and 0.41% from two or more races. 1.22% of the population were Hispanic or Latino of any race. 37.0% were of German,14.3% American, 13.2% Norwegian and 10.9% English ancestry according to Census 2000.

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