San Marino, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of San Marino, California is 12,279 as of the 2023 American Community Survey, making it the 449th-largest city in California. The median household income is $187,633, the median home value is $2,000,001, and the median age is 45.2.
The population has declined 7.6% since 2010 (13,104 → 12,105).
12,279
Population
3260
People / sq mi
$187,633
Median Income
$2,000,001
Median Home Value
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San Marino covers 3.8 sq mi of land at 3260 people per square mile.
About San Marino, CA
Housing cost is the defining feature of San Marino: the median home is valued at $2,000,001. San Marino is a city in California with a population of 12,279.
Earnings sit at the high end: a median household income of $187,633, above the US median of $78,538. Only 3.3% of residents live in poverty, below the national 12.4%. Housing is expensive: the median home is worth $2,000,001, with typical rent around $3,501.
San Marino is among the best-educated US cities: 80.2% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Remote work is widespread — 25.1% of workers stay home, above the national 14.0%, and the average commute runs about 28 minutes each way.
High housing values reframe the income picture in San Marino — even solid earnings stretch less against home prices and rents at this level.
San Marino city Population History (2010-2024)
The city of San Marino city had a population of 13,104 in 2010 and 12,105 in 2024, a -7.6% growth over 14 years. The peak was 13,308 in 2015. Average annual growth rate: -0.56%.
12,105
Population (2024)
13,104
Population (2010)
13,308
Peak (2015)
-0.56%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 13,104 |
| 2011 | 13,155 |
| 2012 | 13,192 |
| 2013 | 13,235 |
| 2014 | 13,263 |
| 2015 | 13,308 |
| 2016 | 13,291 |
| 2017 | 13,244 |
| 2018 | 13,137 |
| 2019 | 13,048 |
| 2020 | 12,475 |
| 2021 | 12,256 |
| 2022 | 12,128 |
| 2023 | 12,079 |
| 2024 | 12,105 |
Race & Ethnicity
| White | 23.0% |
| Black or African American | 0.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.3% |
| Two or More Races | 0.0% |
Economy & Income
$187,633
Median Household Income
$90,890
Per Capita Income
3.3%
Poverty Rate
2.4%
Unemployment Rate
Housing
$2,000,001
Median Home Value
$3,501
Median Rent
82.7%
Owner-Occupied
Education
96.4%
High School+
80.2%
Bachelor's+
Commute
5.0%
Drive Alone
57.5%
Public Transit
25.1%
Work From Home
28.4 min
Avg Commute
Community Profile
9.8%
Foreign Born
39.3%
Non-English at Home
2.1%
Veterans
7.9%
With Disability
96.3%
Health Insurance
98.4%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 26.9% |
| Finance, Insurance & Real Estate | 13.9% |
| Information | 13.4% |
| Manufacturing | 7.2% |
| Education, Health Care & Social Services | 7.1% |
| Retail Trade | 6.2% |
| Arts, Entertainment & Food Services | 3.7% |
| Public Administration | 2.9% |
| Transportation & Warehousing | 2.8% |
| Construction | 1.4% |
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Frequently Asked Questions
San Marino, California has a population of 12,279 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 449th-largest city in California.
The median household income in San Marino, California is $187,633, with 3.3% of residents living below the federal poverty level.
The median home value in San Marino, California is $2,000,001, with median monthly rent at $3,501 and a homeownership rate of 82.7%.
The median age in San Marino, California is 45.2 years. The population is 51.8% male and 48.2% female.
The population has declined 7.6% since 2010 (13,104 → 12,105).
Where to stay in San Marino
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.