| Population | 123 (2010), see rank |
| House Units | 60, see rank |
| Race | Whites:95.9%, Hispanics:3.3%, Blacks:0%, Asians:0%, Others:4.1% |
| Total Area: | 0.44 sq mi |
| Water Area: | 0.00 sq mi (0.00%) |
| State: | California |
| Area: | San Francisco-Oakland-Fremont, CA |
| County: | Marin County |
| City: | San Geronimo |
| Census Tract: | 113000 |
| Census Block Group: | 113000-1 |