THE NAPA COUNTY LAND BRIEF
Land in the
North Coast Range Eastern Slopes setting.
Napa County has 752 square miles of land in California. 6 mapped landscape regions meet across Napa County: North Coast Range Eastern Slopes, Napa-Sonoma-Lake Volcanic Highlands, Foothill Ridges and Valleys, among others.
Oak woodland, chaparral and grassland occupy foothills and low coastal mountains around the Central Valley. Narrow agricultural valleys interrupt this landscape of dry summers and wetter winters.
Regional context: Central California Foothills and Coastal Mountains ↗ · Regional mapping across the county footprint
Where the landscape changes
Napa County intersects 6 mapped regional units. The largest mapped shares are:
- North Coast Range Eastern Slopes32.8%
- Napa-Sonoma-Lake Volcanic Highlands25.7%
- Foothill Ridges and Valleys23.6%
- Napa-Sonoma-Russian River Valleys13.7%
- Bay Flats2.6%
Finding your parcel within Napa County
The atlas lists 11 cities, towns, townships, and Census communities associated with Napa County, including Napa, American Canyon, Deer Park. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Napa County by land and water
The Census records 40.3 square miles of water within Napa County, or 5.1% of its total area. That share is close to Napa County’s 5.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Napa County has 552.9 times the land area of nearby Oakville CDP (1.36 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Lake County, Solano County, Sonoma County, Yolo County within California. A tract near one of these lines should be matched to the county identifier on its own records.

