HomeCaliforniaMarin CountySan Geronimo
San Geronimo, California: commercial real estate data.
San Geronimo is a Census CDP of 583 people across 1.51 square miles of land, in Marin County. Median household income is $171,932, 90.3 percent of occupied homes are owned, and the SBA record carries 1 7(a) approvals to borrowers here worth $200,000 since FY2020.
Underlined figures are computed by MMCG Analytics, not published by the agency.
This is a small place, and the figures below carry wide margins.
The American Community Survey reaches San Geronimo through a sample, not a count, and in a place this size that sample is thin. The population estimate here is 583 with a margin of error of plus or minus 299, which is 51.3 percent of the estimate itself. Every figure whose margin reaches 20 percent is printed with that margin beside it, so you can see the width of each one rather than having to assume it.
Nothing has been removed or adjusted. These are the published federal estimates, shown with the uncertainty the Census publishes alongside them.
San Geronimo
What San Geronimo is
- Census place typeCDP
- Land area1.51 sq mi
- Water area0 sq mi
- Population per square mile of land386 plus or minus 198
- County holding the largest share of its areaMarin County, 100.0 percent
US Census Bureau, cartographic boundary file, places, 2024 vintage. US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
San Geronimo
How many people live in San Geronimo
- Population583 plus or minus 299
- Median age46.5 plus or minus 13.6
- Population under 18112 plus or minus 74
- Share under 1819.2 percent plus or minus 8.0
- Population 65 and over133 plus or minus 86
- Share 65 and over22.8 percent plus or minus 9.0
- Households207 plus or minus 99
- Family households146 plus or minus 62
- Share of households that are families70.5 percent plus or minus 45.1
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
San Geronimo
Income and work in San Geronimo
- Median household income$171,932 plus or minus $106,258
- Per capita income$78,829 plus or minus $20,477
- Civilian labor force289 plus or minus 243
- Employed289 plus or minus 243
- Unemployed0
- Unemployment rate0.0 percent
- Adults 25 and over361 plus or minus 149
- Adults 25 and over with a high school diploma or higher100.0 percent plus or minus 23.5
- Adults 25 and over with a bachelor degree or higher94.5 percent plus or minus 25.7
- Adults 25 and over with a graduate degree75.6 percent plus or minus 25.8
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
San Geronimo
Housing in San Geronimo
- Housing units207 plus or minus 99
- Occupied units207 plus or minus 99
- Vacant units0
- Vacancy rate0.0 percent
- Owner occupied187 plus or minus 91
- Renter occupied20 plus or minus 31
- Ownership rate90.3 percent
- Median owner-occupied home value$1,175,500 plus or minus $414,303
- Single family units207 plus or minus 112
- Share single family100.0 percent plus or minus 25.6
- Units in buildings of two or more0
- Share in buildings of two or more0.0 percent
- Mobile homes0
- Median year structure built1978
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
San Geronimo
How San Geronimo gets to work
- Workers 16 and over who commute225 plus or minus 192
- Commuting under 15 minutes124 plus or minus 137
- Share commuting under 15 minutes55.1 percent plus or minus 38.8
- Commuting 30 minutes or more54 plus or minus 56
- Share commuting 30 minutes or more24.0 percent plus or minus 14.1
- Drove alone69.6 percent plus or minus 25.2
- Carpooled0.0 percent
- Public transport0.0 percent
- Walked1.7 percent plus or minus 3.9
- Worked from home22.1 percent plus or minus 14.9
US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
San Geronimo
SBA loans in San Geronimo (7(a))
- Approvals1
- Gross approval$200,000
- Average approval$200,000
- Median approval$200,000
- Largest approval$200,000
- Jobs supported19
- Jobs per approval19.0
- Loans with a final outcome0
- Paid in full0
- Charged off0
- Median term120 months
- Share on real estate terms of 20 years or more0.0 percent
- Share to franchises0.0 percent
- Distinct lenders1
- Distinct industries by NAICS1
Counted by borrower city: approvals to borrowers whose address is in San Geronimo, in any county, FY2020 to FY2026. Only 0 loans have reached a final outcome, fewer than the 30 a charge-off rate needs, so no rate is published.
US Small Business Administration, 7(a) FOIA release, FY2020 to FY2026 year to date, as of 2026-06-30.
Marin County, not San Geronimo
Marin County context, not San Geronimo figures
- Establishments in Marin County10,049
- Covered employment, Marin County110,934
- Average annual pay, Marin County$93,552
- Housing units permitted, Marin County158
Every figure in this section is published for Marin County as a whole and is not a measurement of San Geronimo.
US Census Bureau, County Business Patterns, 2023. US Bureau of Labor Statistics, Quarterly Census of Employment and Wages, 2024 annual averages. US Census Bureau, Building Permits Survey, 2024 annual.
Coverage
What this page does not hold.
Parcel detail, zoning and the flood zone at an address are not on this page; they resolve at the address in the platform. How this page was built →
Common questions
San Geronimo questions, answered from the record.
How many people live in San Geronimo, California?
583, in 207 households. San Geronimo CDP covers 1.51 square miles of land, which is 386 people per square mile. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
What county is San Geronimo in?
Marin County, which holds 100.0 percent of the place by area. Source: US Census Bureau, cartographic boundary file, places, 2024 vintage.
What is the median household income in San Geronimo?
$171,932. The median owner-occupied home is valued at $1,175,500. Source: US Census Bureau, American Community Survey 5-Year Estimates, place level, 2020-2024 5-year.
How much SBA lending goes to San Geronimo businesses?
1 7(a) approvals totaling $200,000 since FY2020, across 1 lenders, median approval $200,000. These count approvals to borrowers whose address is in San Geronimo, not projects sited inside the place boundary, and they are approvals recorded in the release rather than loans disbursed.
Do SBA loans to San Geronimo borrowers get paid back?
No rate is published for San Geronimo. Only 0 loans have reached a final outcome, fewer than the 30 a charge-off rate needs, so no rate is published. The counts are shown instead.
Are the county figures on this page San Geronimo figures?
No, and they are labeled so. County Business Patterns, QCEW, the Building Permits Survey, BEA product and IRS migration are published for Marin County as a whole and there is no place level equivalent. They appear in one clearly marked section as context and are never presented as measurements of San Geronimo.
Is zoning published for San Geronimo?
No. Nothing on this page presents parcel level zoning.