THE PETROLEUM COUNTY LAND BRIEF
Land in the
Montana Central Grasslands setting.
Petroleum County has 1,655.6 square miles of land in Montana. 4 mapped landscape regions meet across Petroleum County: Montana Central Grasslands, Missouri Breaks Woodland-Scrubland, Sagebrush Steppe, among others.
Rolling semiarid plains are punctuated by buttes, badlands and river breaks. Much of the regional terrain developed on sandstone, siltstone and shale without the leveling influence of continental glaciers.
Regional context: Northwestern Great Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Petroleum County intersects 4 mapped regional units. The largest mapped shares are:
- Montana Central Grasslands64.6%
- Missouri Breaks Woodland-Scrubland30.9%
- Sagebrush Steppe3.3%
- Judith Basin Grassland1.2%
Finding your parcel within Petroleum County
The atlas lists 1 cities, towns, townships, and Census communities associated with Petroleum County, including Winnett. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Petroleum County by land and water
The Census records 18.9 square miles of water within Petroleum County, or 1.1% of its total area. That share is close to Petroleum County’s 1.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Petroleum County has 1,626.4 times the land area of nearby Winnett town (1.02 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Fergus County, Garfield County, Musselshell County, Phillips County, Rosebud County within Montana. A tract near one of these lines should be matched to the county identifier on its own records.

