San Geronimo, California.
Typical home $1,142,074 (+2.4% in a year). San Francisco-Oakland-Berkeley, CA metro.
to buy the typical home at today's mortgage rate — +$2,737 (+84%) since Jan 2020.
- 1 year
- Up $26,943 +2%
- $1,115,131$1,142,074 since Sep 2025
- 5 years
- Down $3,508 -0%
- $1,145,583$1,142,074 since Sep 2021
Monthly payment to buy the typical home
Home value × that month's 30-year mortgage rate, 20% down, principal and interest. This is the line households feel: prices and rates compound each other.
- San Geronimo$5,994
- California$3,997
- United States$1,922
At the last five years' pace, prices here aren't rising.
Typical home values in San Geronimo, CA rose 2.4% over the past year — faster than the nation's +1.2%.
Living in San Geronimo, Marin County, California
San Geronimo, in Marin County, had 510 people in the 2020 census. Unemployment in Marin County was 4.4% in August 2026, and the county had 0.8% fewer jobs in 2025 than the year before. The most people in Marin County work in professional services, then schools and health care.
Written by AI Claude Sonnet 5.5 wrote this on 23 October 2026 from the figures here, a list of nearby places and what it knows. It can be wrong or out of date.
What it’s like
The place. San Geronimo is a very small community in Marin County, with far fewer residents than most towns. Nearly every adult here has a four-year degree, and no one is counted as living below the poverty line. Household incomes in the county run high, and the typical home here is worth far more than the typical home across much of the country. Winters are mild, with chilly days and cool nights in January, and summers are warm but not hot, with August the warmest month. Snow is rare, and the year brings a fair amount of rain.
Work. Residents work mostly in professional and business services, in schools, hospitals and social care, in shops, and in banking, insurance and property. Across Marin County, some of the largest workplaces are BioMarin Pharmaceutical, which makes medicines, Marinhealth Medical Center, a general hospital, and Novato Unified, the school district. Unemployment in the county is a little lower than a year ago, though the county has fewer jobs than it did the year before.
Things to do. The closest outing is Muir Woods National Monument, a protected area of old redwoods a short drive away. A longer drive takes you to Golden Gate Park in San Francisco, a large garden park, and to Point Reyes National Seashore, a protected stretch of coast. For museums, the San Francisco Museum of Modern Art is also a longer drive away.
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- 94%of adults have a degree
- 0%below the poverty line
What people in Marin County work in
Employed residents by industry, from the Census survey. Marin County had 110,071 jobs in 2025, 0.8% fewer than the year before (Bureau of Labor Statistics).
Weather through the year
Coldest in January, with highs near 57° and lows near 43°; warmest in August, with highs near 81° and lows near 56°. About 34 inches of rain a year, and little or no snow.
Average daily high and low, 1991–2020, at the San Rafael Civic Ctr weather station, 7 miles away (NOAA).
Largest workplaces in Marin County
- BioMarin PharmaceuticalPatent medicine preparations manufacturing2,086
- Marinhealth Medical CenterGeneral hospital1,429FTE
- Township Building ServicesJanitorial services1,257
- Ultragenyx - NovatoBiotechnology research and development laboratories or services in genetics691
- Novato UnifiedSchool district685FTE
- Dominican University of CaliforniaUniversity or college541
- College of MarinTwo-year college508
- KFH - San RafaelGeneral hospital489FTE
Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 152 workplaces with 20 or more staff, 17,838 people in all across the county; San Geronimo has none of its own. Hospitals come from their Medicare cost reports (CMS, 2023), school districts from the Common Core of Data (NCES, 2023–24) and colleges from IPEDS (NCES, 2023–24); FTE marks full-time equivalent staff. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.
Natural hazards
- LandslidesRelatively high
- WildfireRelatively high
- Inland floodingRelatively high
- EarthquakesRelatively high
FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms in San Geronimo’s census tracts, against the rest of the country; all of them together, relatively high. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.
From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on Marin County and the San Francisco-Oakland-Berkeley, CA metro.
San Geronimo home values
Zillow measures a city over its municipal boundary. Against the state and national figures, mid-tier homes, smoothed and seasonally adjusted.
- San Geronimo$1,142,074
- California$761,538
- United States$366,157
When this market ran hot
Each cell is that month's year-on-year home-value growth. Read left to right, top row is the latest year — the 2021–22 band is the boom.
Zip codes with a San Geronimo address
A different geography, not a breakdown. The figure above covers the municipality; these zips cover everywhere the Post Office calls San Geronimo — often including townships beyond the city limits. Both come straight from Zillow, and they are not expected to average out.