San Geronimo Flag

San Geronimo

County:
Marin County
County Seat:
No
Area (mi²):
1.508
State:
California

San Geronimo is a CDP located in Marin County, California. San Geronimo has a 2025 population of 422 . San Geronimo is currently declining at a rate of -0.47% annually but its population has increased by 139.77% since the most recent census, which recorded a population of 176 in 2020.

The average household income in San Geronimo is $301,074 with a poverty rate of 0%. The median age in San Geronimo is 46.4 years: 46.3 years for males, and 46.5 years for females. For every 100 females there are 137.1 males.

422
Total Population
280
Density (mi²)
-2 -0.47%
Growth

San Geronimo Population

San Geronimo Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of San Geronimo includes 100% White, and smaller percentages for and multiracial populations.

Population by Race

White (100%)

Race
Population
Percentage (of total)
White562100%

San Geronimo Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

San Geronimo's average per capita income is $230,147. Household income levels show a median of $206,375. The poverty rate stands at 0%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Families$250,001$363,662
Married Families$250,001-
Households$206,375$301,074
Non Families--

$230,147

Average Income

$206,375

Median Household Income

0%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)