THE CLARK COUNTY LAND BRIEF
Land in the
Western Cascades Lowlands and Valleys setting.
Clark County has 628.5 square miles of land in Washington. 4 mapped landscape regions meet across Clark County: Western Cascades Lowlands and Valleys, Portland/Vancouver Basin, Valley Foothills, among others.
Volcanic mountains, deeply cut stream valleys and glaciated high country define the Cascades. Conifer forests change with elevation, giving way to mountain meadows and rocky alpine terrain.
Regional context: Cascades ↗ · Regional mapping across the county footprint
Where the landscape changes
Clark County intersects 4 mapped regional units. The largest mapped shares are:
- Western Cascades Lowlands and Valleys42.2%
- Portland/Vancouver Basin42.1%
- Valley Foothills14.9%
- Western Cascades Montane Highlands0.9%
Willamette Valley in Clark County
The Willamette River's floodplains and terraces sit among low hills and scattered buttes. The valley's prairie, oak and riparian landscape differs markedly from the conifer-covered mountains around it.
Read the regional source ↗Finding your parcel within Clark County
The atlas lists 27 cities, towns, townships, and Census communities associated with Clark County, including Vancouver, Camas, Hockinson. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Clark County by land and water
The Census records 27.1 square miles of water within Clark County, or 4.1% of its total area. That share is close to Clark County’s 4.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Clark County has 58.7 times the land area of nearby Venersborg CDP (10.7 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Cowlitz County, Skamania County within Washington. A tract near one of these lines should be matched to the county identifier on its own records.

