THE YAMHILL COUNTY LAND BRIEF
Land in the
Valley Foothills setting.
Yamhill County has 715.9 square miles of land in Oregon. 5 mapped landscape regions meet across Yamhill County: Valley Foothills, Prairie Terraces, Mid-Coastal Sedimentary, among others.
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.
Regional context: Willamette Valley ↗ · Regional mapping across the county footprint
Where the landscape changes
Yamhill County intersects 5 mapped regional units. The largest mapped shares are:
- Valley Foothills34.8%
- Prairie Terraces27.7%
- Mid-Coastal Sedimentary14.7%
- Volcanics12.2%
- Willamette River and Tributaries Gallery Forest10.5%
Coast Range in Yamhill 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 Yamhill County
The atlas lists 13 cities, towns, townships, and Census communities associated with Yamhill County, including Grand Ronde, McMinnville, Newberg. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Yamhill County by land and water
The Census records 2.46 square miles of water within Yamhill County, or 0.3% of its total area. That share is close to Yamhill County’s 0.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Yamhill County has 67.7 times the land area of nearby McMinnville city (10.6 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Clackamas County, Marion County, Polk County, Tillamook County, Washington County within Oregon. A tract near one of these lines should be matched to the county identifier on its own records.

