| Official Zip Code Name | San Geronimo |
| Zip Code State | California |
| Primary County: | Marin |
| Area Code | 415/628 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 8 |
| Elevation Range | 1043 ft. |
| Area | 1.597 Sqm. |
| Coordinates(Y,X) | 38.004228, -122.677422 |