THE COWLITZ COUNTY LAND BRIEF
Land in the
Western Cascades Lowlands and Valleys setting.
Cowlitz County has 1,141.2 square miles of land in Washington. 8 mapped landscape regions meet across Cowlitz County: Western Cascades Lowlands and Valleys, Cowlitz/Chehalis Foothills, Western Cascades Montane Highlands, 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
Cowlitz County intersects 8 mapped regional units. The largest mapped shares are:
- Western Cascades Lowlands and Valleys48.4%
- Cowlitz/Chehalis Foothills20.9%
- Western Cascades Montane Highlands10.4%
- Volcanics9.1%
- Willapa Hills8.6%
Puget Lowland in Cowlitz County
A glacial lowland surrounds Puget Sound with islands, bays, peninsulas and rolling terrain. Moraines, outwash plains and river terraces create a varied setting beneath the region's maritime climate.
Read the regional source ↗Coast Range in Cowlitz County
Pacific-facing coastal mountains support moisture-loving conifers, with marine terraces, dunes and beaches along the ocean edge. Inland slopes and the immediate coast have different vegetation patterns.
Read the regional source ↗Finding your parcel within Cowlitz County
The atlas lists 10 cities, towns, townships, and Census communities associated with Cowlitz County, including Longview, Kelso, Longview Heights. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Cowlitz County by land and water
The Census records 25.2 square miles of water within Cowlitz County, or 2.2% of its total area. That share is close to Cowlitz County’s 2.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Cowlitz County has 852.3 times the land area of nearby Lexington CDP (1.34 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Clark County, Lewis County, Skamania County, Wahkiakum County within Washington. A tract near one of these lines should be matched to the county identifier on its own records.

