THE MARIN COUNTY LAND BRIEF
Land in the
Marin Hills setting.
Marin County has 520.1 square miles of land in California. 5 mapped landscape regions meet across Marin County: Marin Hills, Point Reyes/Farallon Islands, Coastal Franciscan Redwood Forest, 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
Marin County intersects 5 mapped regional units. The largest mapped shares are:
- Marin Hills57%
- Point Reyes/Farallon Islands18.2%
- Coastal Franciscan Redwood Forest10.8%
- Bodega Coastal Hills9.3%
- Bay Flats4.7%
Coast Range in Marin 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 Marin County
The atlas lists 31 cities, towns, townships, and Census communities associated with Marin County, including Novato, San Rafael, Inverness. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Marin County by land and water
The Census records 308 square miles of water within Marin County, or 37.2% of its total area. That share is close to Marin County’s 37.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Marin County has 398.6 times the land area of nearby Nicasio CDP (1.31 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Contra Costa County, San Francisco County, Solano County, Sonoma County within California. A tract near one of these lines should be matched to the county identifier on its own records.

