THE SOLANO COUNTY LAND BRIEF
Land in the
Yolo Alluvial Fans setting.
Solano County has 821.7 square miles of land in California. 9 mapped landscape regions meet across Solano County: Yolo Alluvial Fans, Suisun Terraces and Low Hills, Delta, among others.
The Sacramento and San Joaquin river systems occupy broad sediment-filled basins, with fans and terraces toward the valley margins. These nearly level landscapes contrast with California's surrounding hills and mountains.
Regional context: Central California Valley ↗ · Regional mapping across the county footprint
Where the landscape changes
Solano County intersects 9 mapped regional units. The largest mapped shares are:
- Yolo Alluvial Fans24.6%
- Suisun Terraces and Low Hills22.7%
- Delta22.5%
- East Bay Hills/Western Diablo Range8.5%
- Yolo/American Basin8.3%
Central California Foothills and Coastal Mountains in Solano County
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.
Read the regional source ↗Finding your parcel within Solano County
The atlas lists 11 cities, towns, townships, and Census communities associated with Solano County, including Fairfield, Vallejo, Vacaville. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Solano County by land and water
The Census records 84.4 square miles of water within Solano County, or 9.3% of its total area. That share is close to Solano County’s 9.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Solano County has 205.2 times the land area of nearby Suisun City city (4.01 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Contra Costa County, Marin County, Napa County, Sacramento 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.

