THE MALHEUR COUNTY LAND BRIEF
Land in the
Dissected High Lava Plateau setting.
Malheur County has 9,887.7 square miles of land in Oregon. 10 mapped landscape regions meet across Malheur County: Dissected High Lava Plateau, Owyhee Uplands and Canyons, High Lava Plains, among others.
Lava plains, stony uplands, dry valleys and scattered ranges form the Northern Basin and Range. Sagebrush and grassland give way to juniper and other woodland in higher or rockier settings.
Regional context: Northern Basin and Range ↗ · Regional mapping across the county footprint
Where the landscape changes
Malheur County intersects 10 mapped regional units. The largest mapped shares are:
- Dissected High Lava Plateau39.9%
- Owyhee Uplands and Canyons21.6%
- High Lava Plains12.5%
- Continental Zone Foothills11.7%
- Treasure Valley5%
Blue Mountains in Malheur County
The Blue Mountains combine open mountain ranges and dissected volcanic uplands. The Wallowa and Elkhorn high country includes older granitic and metamorphic rocks above the surrounding lava landscape.
Read the regional source ↗Snake River Plain in Malheur County
The Snake River Plain is lower and gentler than its surrounding mountains. Alluvial valleys, sagebrush-covered plains, low hills and scattered lava fields form its principal landscape patterns.
Read the regional source ↗Finding your parcel within Malheur County
The atlas lists 9 cities, towns, townships, and Census communities associated with Malheur County, including Harper, Ontario, Brogan. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Malheur County by land and water
The Census records 42.1 square miles of water within Malheur County, or 0.4% of its total area. That share is close to Malheur County’s 0.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Malheur County has 4,753.7 times the land area of nearby Jordan Valley city (2.08 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Baker County, Grant County, Harney County within Oregon. A tract near one of these lines should be matched to the county identifier on its own records.

