San Geronimo is a community in Marin County, California, home to about 583 people across 1.5 square miles. Its ZIP code is 94963.
Homes sold for a median of $595 per square foot in the three months ending August 2026, a seller’s market.
Mostly San Geronimo; also Lagunitas-Forest Knolls
Each card is that ZIP code’s whole market, including any part outside San Geronimo. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | San Francisco International Airport (SFO)31 miles away |
|---|---|
| Nearest city of 250,000+ | San Francisco, CA28 miles away |
| Nearest city of 1 million+ | Los Angeles, CA364 miles away |
Straight-line distances from the center of San Geronimo; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
San Geronimo had 510 residents in the 2020 census, up 17% since 2000.
It’s the 1181st largest of 1,563 towns in California by population.
Marin County grew from 15,702 residents in 1900 to 262,321 in 2020.
Marin County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 42°F. About 34.5 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, San Rafael Civic Ctr, CA weather station (7 miles away).
106,249 jobs at 10,049 businesses in Marin County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in San Geronimo.
Nearest hospitals
Providers with an office here
| Mental health providers | 2 |
|---|
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (4 nearby)
Grocery stores
Libraries
Museums
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Lagunitas Elementary. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Lagunitas ElementarySan Geronimo | K–8 | 68 | Public | 0.7 mi |
| San Geronimo Valley ElementarySan Geronimo | K–6 | 93 | Public | 0.7 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Lagunitas-Forest Knolls.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.