San Marino, CA demographics:
population, income, and more

Total population
12,216
-0.5% year-over-year change
Median household income
$214,167/yr
14.1% year-over-year change
Housing units
4,439
1.7% year-over-year change

San Marino population

How many people live in San Marino

San Marino is home to 12,216 residents, according to the most recent Census data. Gender-wise, 50.6% of San Marino locals are male, and 49.4% are female.

Total population
12,216
-0.5% year-over-year change
Gender ratio
Male
50.6%
6,181
Female
49.4%
6,035
Value Percent YoY change
Male 6,181 50.6% -2.8%
Female 6,035 49.4% 1.9%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in San Marino is 46, with the population distributed as follows: about 18.6% are children under 15, then 9% are in the 15 to 24 age group. Adults between 25 and 44 make up 20.6% of the population, while another 29.4% fall into the 45 to 64 bracket. Finally, around 22.3% are 65 or older.

Median age
45.7
Age breakdown
Under 15
18.6%
15 to 24
9%
25 to 44
20.6%
45 to 64
29.4%
Over 65
22.3%
Value Percent YoY change
Under 15 2,274 18.6% -0.3%
15 to 24 1,101 9% -5.6%
25 to 44 2,519 20.6% -4.6%
45 to 64 3,598 29.4% 3.9%
Over 65 2,724 22.3% -0.2%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In San Marino, 51.9% of the population are US-born citizens, while 31.7% have gained naturalized citizenship. At the same time, 16.4% of residents are non-citizens. As for race, 22.7% of locals are Caucasian, 0.1% are African American and 68.1% have Asian roots. There’s also a share of 8% that includes residents with two or more races.

Citizenship
U.S.-born citizens
51.9%
Non-U.S.-born citizens
31.7%
Non-citizens
16.4%
Value Percent YoY change
U.S.-born citizens 6,337 51.9% -0.1%
Non-U.S.-born citizens 3,869 31.7% -0.3%
Non-citizens 2,010 16.4% -2.3%
Racial breakdown
White
22.7%
Black or African American
0.1%
American Indian and Alaska Native
0.1%
Asian
68.1%
Native Hawaiian and other Pacific Islander
0%
Two or more races
8%
Other
1.1%
Value Percent
White 2,770 22.7%
Black or African American 15 0.1%
American Indian and Alaska Native 8 0.1%
Asian 8,318 68.1%
Two or more races 973 8%
Other 132 1.1%

Households in San Marino

A peek inside San Marino households

San Marino has 3,910 households, with an average of 3 members in each. Of these, 85.5% are families, while the remaining 14.5% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
3,910
2.7% year-over-year change
Average people per household
3
Non-family households
567
Family households
3,343
Value Percent YoY change
Non-family households 567 14.5% -1.7%
Family households 3,343 85.5% 3.5%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in San Marino

The housing landscape of San Marino

San Marino's housing consists of 4,439 units, with 98.6% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 0.4% and offer a more compact, shared living style.

Housing units
4,439
1.7% year-over-year change
Housing types
Value Percent
1 unit, detached 4,377 98.6%
1 unit, attached 20 0.4%
3 or 4 units 42 1%
Homes built since 2020
21
-12.5% year-over-year change

The age of buildings in San Marino

In San Marino, the median construction year is 1943. About 40.8% of homes were built before the 1940s, with another 28.2% going up by 1949. Most development happened in the second half of the 20th century. Then, 1.1% of homes were added from 2000 to 2009, 1.6% between 2010 and 2019, and 0.5% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,811 40.8% 2.3%
Built between 1940 and 1949 1,251 28.2% -3.0%
Built between 1950 and 1959 589 13.3% 3.3%
Built between 1960 and 1969 361 8.1% -2.4%
Built between 1970 and 1979 110 2.5% 30.9%
Built between 1980 and 1989 68 1.5% 41.7%
Built between 1990 and 1999 108 2.4% 1.9%
Built between 2000 and 2009 49 1.1% 58.1%
Built between 2010 and 2019 71 1.6% 2.9%
Built in 2020 or later 21 0.5% -12.5%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

San Marino occupancy rates

Out of the 3,910 occupied housing units in San Marino, 82.8% are owner-occupied, while 17.2% are lived in by tenants. Meanwhile, 11.9% of all homes on the local market sit vacant.

Occupied housing units
3,910
2.7% year-over-year change
Occupancy breakdown
Renter occupied
673
Owner occupied
3,237
Value Percent YoY
change
Renter occupied 673 17.2% 2.4%
Owner occupied 3,237 82.8% 2.8%
Unoccupied housing units
11.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

San Marino housing costs

Housing costs in San Marino come to a median of $4,001 per month, while tenants specifically pay a median gross rent of $3,501.

Median housing costs per month
$4,001/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in San Marino
$3,501/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in San Marino

San Marino education at a glance

About 6.7% of the population in San Marino went to high school, while 8.2% pursued college studies. Another 3.4% earned an associate degree and 36.4% hold a bachelor’s. Meanwhile, 43% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 210 2.3% 10.5%
High school diploma 626 6.7% -12.8%
College diploma 765 8.2% -16.8%
Associate degree 316 3.4% -3.4%
Bachelor's degree 3,391 36.4% -2.0%
Graduate degree 3,997 43% 6.2%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in San Marino

How much people earn in San Marino

The average annual household income in San Marino was $310,978 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +9% change from the previous year. At the same time, the median income stood at $214,167, reflecting a +14.1% shift over the same period.

Average household income in San Marino
$310,978/year
9.0% year-over-year change
Median household income in San Marino
$214,167/year
14.1% year-over-year change

San Marino income by age

In San Marino, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $238,879. Those with someone between 45 and 64 in charge, often well established professionally, earn $250,001 overall. Overall, 93.2% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
25 - 44 $238,879 27.1%
45 - 64 $250,001 0.0%
Over 65 $128,092 5.8%
Above poverty level
11,362
Below poverty level
822
Value Percent YoY
change
Above poverty level 11,362 93.2% -1.5%
Below poverty level 822 6.8% 15.4%

Average renter income in San Marino

To get a better sense of what renters earn on average in San Marino, their median household income was $173,576 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 24.2%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$173,576
Rent-to-income ratio
24.2%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in San Marino

Workforce and job types in San Marino

The job market in San Marino is powered by 5,300 working residents, spread across a range of industries and roles. 96.1% of the working population are employed in professional or administrative positions, while 3.9% are in hands-on or service-based jobs. Also, 25.3% run their own businesses, 53.9% are employed by private companies, and 11.8% work in the public sector.

Workforce demographics

Working population
5,300
-1.8% year-over-year change
White collar
5,093
Blue collar
207
Value Percent YoY change
White collar 5,093 96.1% 1.1%
Blue collar 207 3.9% -42.7%
Employer type
Self employees
25.3%
Private companies
53.9%
Governmental workers
11.8%
Not for profit companies
9%
Value Percent YoY change
Self employees 1,341 25.3% 7.5%
Private companies 2,859 53.9% -11.1%
Governmental workers 623 11.8% 22.9%
Not for profit companies 477 9% 12.0%
Unemployment rate
5.3%
29.7% year-over-year change

Available workforce

The unemployment rate in San Marino stands at 5.3%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in San Marino

How people get around in San Marino

Commuting methods vary: 66.3% of residents travel by personal vehicle and 1.8% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 3,352 66.3% -3.5%
Bus or trolleybus 159 3.2% -8.6%
Bicycle 9 0.2% 0.0%
Walk 90 1.8% -5.3%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in San Marino by zipcode?

Zipcode Population Number of households Median income Average income
91108 12,401 4,038 $204,847 $306,889

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FAQs about San Marino demographics 

What is the total population of San Marino?

San Marino has a total population of 12,216 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -0.5% compared to a year ago.

What is the gender ratio in San Marino?

The gender ratio in San Marino is as follows:
  • 50.6% males (6,181 residents)
  • 49.4% females (6,035 residents)

What is the median age in San Marino?

The median age in San Marino is 45.7.

What is the age distribution of the population in San Marino?

The age distribution in San Marino is as follows:
  • Under 15: 18.6% (2,274 residents)
  • Ages 15-24: 9% (1,101 residents)
  • Ages 25-44: 20.6% (2,519 residents)
  • Ages 45-64: 29.4% (3,598 residents)
  • Over 65: 22.3% (2,724 residents)

What is the racial and ethnic makeup of San Marino?

The racial and ethnic makeup of San Marino is as follows:
  • White: 22.7% (2,770 residents)
  • Black or African American: 0.1% (15 residents)
  • American Indian and Alaska Native: 0.1% (8 residents)
  • Asian: 68.1% (8,318 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 8% (973 residents)
  • Other: 1.1% (132 residents)

What percentage of the population in San Marino are U.S.-born citizens?

U.S.-born citizens represent 51.9% of the population in San Marino.

How many housing units are there in San Marino?

There are 4,439 housing units in San Marino, reflecting a +1.7% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in San Marino and what is the average household size?

San Marino has a total of 3,910 households, with an average of 3 people in each.

What is the median household income in San Marino?

San Marino has a median household income of $214,167, representing a +14.1% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for San Marino?

The employment rate is 94.7% in San Marino, with a workforce of 5,300 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 96.1% (5,093 residents)
  • Blue-collar workers: 3.9% (207 residents)

Places of employment:
  • Self-employed: 25.3% (1,341 residents)
  • Private companies: 53.9% (2,859 residents)
  • Governmental workers: 11.8% (623 residents)
  • Not-for-profit companies: 9% (477 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025