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.

Demographics

The racial composition of San Geronimo includes 100% White, and smaller percentages for Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander, other race, Two or more races and multiracial populations.

Population by Race

White

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Two or more races

Race	Population	Percentage (of total)
White	562	100%
Black or African American	0	0%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%
Two or more races	0	0%

San Geronimo Marital Status

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