San Geronimo California Map
Explore San Geronimo, California, with this interactive street and satellite map.
This page also offers TOPO MAPS — the official USGS topographic sheets — plus USGS aerial imagery, a labelled USNG grid overlay, a distance and bearing tool, and a GPS grid-reference readout. See How to Use This Map below.
Interactive Map of San Geronimo, California
How to Use This San Geronimo, California Map
This interactive map shows the street layout and satellite imagery for San Geronimo, California. Use the Map and Satellite buttons above to switch between street map and aerial imagery views. Use the + and − buttons to zoom in or out, or scroll your mouse wheel while holding the Control key to zoom. On a touchscreen, use a two-finger pinch gesture. Drag the map to pan to any area of California or beyond.
Click ⛶ Fullscreen to expand the map to fill your screen. To return to the normal page view, press the Escape key, click the ✕ Exit Fullscreen button that appears above the map, or on a mobile device tap the back button (Android) or the close icon (iOS).
TOPO MAPS — NEW. Click the green 🔍 Search Maps button below the map to open a second map with a Base map row offering three choices. OSM is the standard OpenStreetMap street map. Topo shows the official USGS topographic maps from The National Map — contours, hydrography, land cover and shaded relief, the same mapping used for hiking, hunting and back-country navigation in the Adirondacks, the Catskills and the Finger Lakes. Imagery shows USGS aerial photography, mostly 1-metre NAIP. The search box finds any US town, county or landmark by name, so you are not limited to San Geronimo.
Reading the map like a paper quad. Click Grid to overlay the U.S. National Grid (USNG), labelled along the edges exactly as a printed topographic sheet is — at normal zoom the squares are one kilometre across, so you can read a six-figure grid reference by eye and judge distance directly off the map. Click Measure, then tap two points, to get the distance between them together with the grid bearing in degrees and mils, the true bearing, and the magnetic bearing to set on a compass.
Click 📍 My position to take a single GPS reading from your device. It marks where you are and reports your position as a USNG grid reference as well as plain latitude and longitude — USNG being the format FEMA and US search and rescue teams work from — with a Copy position button so you can paste it straight into a text message. It takes one reading and stops, rather than tracking continuously, to conserve your battery. Note that map tiles need cell coverage, but a GPS reading does not — your coordinates stay correct even where the map itself cannot load.
| City | San Geronimo |
| State | California (CA) |
| County | Marin County |
| Country | United States of America |
| Timezone | Pacific Time (America/Los_Angeles) |
| Latitude | 38.013256 |
| Longitude | -122.663873 |
| Population | 510 |
| Density | 130.6 /km² |
| Incorporated | N/A |
| ZIP Code | 94963 |
| Area Code | 510 |
| County Seat | San Rafael |
| School District | Lagunitas Elementary School District |
About San Geronimo, California
San Geronimo is a locality in Marin County, California, United States. It is a small community with a population of 510. The population density is 130.6 people per km². San Geronimo is located at 38.0133°N, 122.6639°W. It observes the Pacific Time (America/Los_Angeles) timezone. ZIP code: 94963.San Geronimo occupies a quiet pocket of the landscape where the morning fog leaves a silver residue on the deep, verdant ferns. It lies 6.2 miles west-northwest of San Anselmo, CA (from San Anselmo, CA: bearing 296°T), and is situated 7.7 miles west-northwest of San Rafael. The Maurice Thorner Memorial Open Space Preserve defines the immediate perimeter of San Geronimo, providing a sanctuary where the land remains largely untamed and hushed. Nearby, Big Carson Creek carves a narrow, rhythmic path through the earth, its cool waters drawing life toward the shadows of the valley floor. While the distant Coast Ranges silhouette the horizon in a bruised, violet hue, the atmosphere here is dominated by a persistent, damp stillness that seems to slow the very pulse of the day.
History lingers in the quietude of the surrounding acreage, a legacy of agricultural roots that once favored the rugged, high-yielding soil of the region. Though the bustle of modern commerce feels worlds away, San Geronimo maintains a tether to the wider geography, with Nicasio Reservoir sitting four miles to the north as a still, reflective expanse of water. Residents follow the Ridge Trail toward Bull Tail Valley when the sun begins to lean low, casting long, amber light across the grasses. Even as the wind brings a faint, salt-tinged memory of the distant Bolinas Lagoon and the distant Kent Island, the life of the people here is measured by the steady, unpretentious cycles of the seasons and the slow, deliberate growth of the oak savanna.
Nearby Outdoor Places
- Gary Giacomini Open Space Preserve (Local Conservation Area) — 0.1 mi, 180° S
- French Ranch Open Space Preserve (Local Conservation Area) — 0.5 mi, 011° N
- Marin Municipal Water District Watershed (Local Resource Management Area) — 0.9 mi, 185° S
- The Phoenix Collection Tea Museum (Museum) — 2.1 mi, 269° W
- Samuel P. Taylor State Park (State Park) — 2.1 mi, 264° W
- Golden Gate National Recreation Area (National Recreation Area) — 2.3 mi, 307° NW · 113k acres
- Leo T. Cronin Fish Viewing Area (Attraction) — 2.5 mi, 256° W
- Little Carson Falls (Attraction) — 3.2 mi, 160° S
- Point Reyes National Seashore (National Lakeshore) — 4.7 mi, 221° SW · 135k acres
- Phillip Burton Wilderness Area (Wilderness Area) — 5.1 mi, 214° SW · 33k acres
- Mount Tamalpais State Park (State Park) — 5.1 mi, 177° S
- Greater Farallones National Marine Sanctuary (Marine Protected Area) — 5.8 mi, 194° S
- Clem Miller Lookout (Viewpoint) — 5.8 mi, 190° S
- Music Stand (Monument) — 6.5 mi, 157° SE
- Marin Art & Garden Center, Ross (Attraction) — 7.0 mi, 121° SE
- Throne (Monument) — 7.1 mi, 159° S
- Bartolini Gallery (Museum) — 7.2 mi, 095° E
- Showcase Theatre (Theatre) — 7.2 mi, 095° E
- San Rafael Open Space (Nature Reserve) — 7.7 mi, 116° SE
- Marin County Historical Society Museum (Museum) — 7.8 mi, 110° E
- Marin Museum of the American Indian (Museum) — 7.8 mi, 025° NE
- California Coastal National Monument (National Monument) — 7.9 mi, 192° S · 8,946 acres
- Sitting Bull Rock and memorial (Monument) — 7.9 mi, 141° SE
- Kule Loklo (Attraction) — 7.9 mi, 286° W
- Gallery Route One (Gallery) — 8.5 mi, 296° NW
- Leona (Gallery) — 8.6 mi, 296° NW
- Tamalpais Maiden (Public Artwork) — 8.9 mi, 121° SE
- Amphitheater (Theatre) — 9.2 mi, 094° E
- Monterey Bay National Marine Sanctuary (Marine Protected Area) — 9.3 mi, 168° S
- San Pablo Bay National Wildlife Refuge (National Wildlife Refuge) — 11.3 mi, 052° NE · 43k acres
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About This San Geronimo Map Page
This page provides an embedded street and satellite map of San Geronimo, California. Coordinates: 38.013256, -122.663873. Live weather conditions are sourced directly from the National Weather Service. Real-time local and world news feeds keep the page current.
Detailed location data for San Geronimo includes the ZIP code (94963), telephone area code (510), county seat of Marin County (San Rafael), and school district assignment (Lagunitas Elementary School District).
Search Maps opens a second, independent map. It searches OpenStreetMap for any US town, county or landmark by name; offers USGS topographic maps and USGS aerial imagery as base layers; overlays a labelled U.S. National Grid (USNG) so the map can be read like a printed topographic quad; measures distance and grid, true and magnetic bearings between any two points; and takes a single GPS fix reporting your position as a USNG grid reference and as latitude and longitude. Map tiles require cell coverage, but a GPS position does not, so the coordinates remain correct even where the map cannot load.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity. Population figures are sourced from the 2020 US Census.
| Page generated | September 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Map layers | Google Maps; © OpenStreetMap contributors; USGS The National Map topographic and aerial imagery (public domain); magnetic declination from NOAA NCEI (World Magnetic Model) |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. |
