THE WASCO COUNTY LAND BRIEF
Land in the
Umatilla Plateau setting.
Wasco County has 2,381.1 square miles of land in Oregon. 9 mapped landscape regions meet across Wasco County: Umatilla Plateau, John Day/Clarno Uplands, Oak/Conifer Foothills, among others.
Basalt underlies this dry plateau of grassland and sagebrush. Windblown soils cover some uplands, while ancient flood paths exposed rock across the region's scabland terrain.
Regional context: Columbia Plateau ↗ · Regional mapping across the county footprint
Where the landscape changes
Wasco County intersects 9 mapped regional units. The largest mapped shares are:
- Umatilla Plateau30.5%
- John Day/Clarno Uplands17.4%
- Oak/Conifer Foothills13.6%
- Ponderosa Pine/Bitterbrush Woodland10%
- Deschutes/John Day Canyons8.8%
Blue Mountains in Wasco 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 ↗Eastern Cascades Slopes and Foothills in Wasco County
On the Cascades' drier eastern side, open pine forests mingle with volcanic cones, buttes and basins. Larger river valleys and lake basins interrupt the surrounding uplands.
Read the regional source ↗Finding your parcel within Wasco County
The atlas lists 13 cities, towns, townships, and Census communities associated with Wasco County, including The Dalles, Pine Grove, Chenoweth. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Wasco County by land and water
The Census records 13.8 square miles of water within Wasco County, or 0.6% of its total area. That share is close to Wasco County’s 0.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Wasco County has 1,708.1 times the land area of nearby Maupin city (1.39 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Clackamas County, Gilliam County, Hood River County, Jefferson County, Marion County, Sherman County, Wheeler County within Oregon. A tract near one of these lines should be matched to the county identifier on its own records.

