THE SAN FRANCISCO COUNTY LAND BRIEF
Land in the
San Francisco Peninsula setting.
San Francisco County has 46.7 square miles of land in California. 3 mapped landscape regions meet across San Francisco County: San Francisco Peninsula, Bay Terraces/Lower Santa Clara Valley, Point Reyes/Farallon Islands.
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
San Francisco County intersects 3 mapped regional units. The largest mapped shares are:
- San Francisco Peninsula97.7%
- Bay Terraces/Lower Santa Clara Valley1.9%
- Point Reyes/Farallon Islands0.4%
Coast Range in San Francisco 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 San Francisco County
The atlas lists 1 cities, towns, townships, and Census communities associated with San Francisco County, including San Francisco. The list includes overlapping geography types and does not divide the county into exclusive service areas.
San Francisco County by land and water
The Census records 185.2 square miles of water within San Francisco County, or 79.9% of its total area. That share is close to San Francisco County’s 79.9%. This is geographic context; waterfront status and usable land must be checked at the parcel.
The Census boundary meets Alameda County, Contra Costa County, Marin County, San Mateo County within California. A tract near one of these lines should be matched to the county identifier on its own records.

