THE BENTON COUNTY LAND BRIEF
Land in the
Mid-Coastal Sedimentary setting.
Benton County has 675.2 square miles of land in Oregon. 5 mapped landscape regions meet across Benton County: Mid-Coastal Sedimentary, Valley Foothills, Prairie Terraces, among others.
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.
Regional context: Coast Range ↗ · Regional mapping across the county footprint
Where the landscape changes
Benton County intersects 5 mapped regional units. The largest mapped shares are:
- Mid-Coastal Sedimentary33.2%
- Valley Foothills27.4%
- Prairie Terraces18%
- Willamette River and Tributaries Gallery Forest12%
- Volcanics9.4%
Willamette Valley in Benton 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 Benton County
The atlas lists 11 cities, towns, townships, and Census communities associated with Benton County, including Albany, Corvallis, Philomath. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Benton County by land and water
The Census records 2.96 square miles of water within Benton County, or 0.4% of its total area. That share is close to Benton County’s 0.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Benton County has 326.7 times the land area of nearby Philomath city (2.07 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Lane County, Lincoln County, Linn County, Polk County within Oregon. A tract near one of these lines should be matched to the county identifier on its own records.

