THE ASOTIN COUNTY LAND BRIEF
Land in the
Lower Snake and Clearwater Canyons setting.
Asotin County has 636.1 square miles of land in Washington. 5 mapped landscape regions meet across Asotin County: Lower Snake and Clearwater Canyons, Dissected Loess Uplands, Canyons and Dissected Uplands, 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
Asotin County intersects 5 mapped regional units. The largest mapped shares are:
- Lower Snake and Clearwater Canyons30.6%
- Dissected Loess Uplands29.5%
- Canyons and Dissected Uplands21.3%
- Canyons and Dissected Highlands15.1%
- Mesic Forest Zone3.5%
Blue Mountains in Asotin 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 ↗Finding your parcel within Asotin County
The atlas lists 5 cities, towns, townships, and Census communities associated with Asotin County, including Clarkston Heights-Vineland, West Clarkston-Highland, Clarkston. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Asotin County by land and water
The Census records 4.36 square miles of water within Asotin County, or 0.7% of its total area. That share is close to Asotin County’s 0.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Asotin County has 5,300.6 times the land area of nearby Anatone CDP (0.12 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Garfield County, Whitman County within Washington. A tract near one of these lines should be matched to the county identifier on its own records.

