City in Los Angeles County, California · 3.8 sq mi · 3,150 people per sq mi
11,861 people live in San Marino. The typical household earns $214,167, and the median resident is 45.7 years old.
2026 projection
From 12,513 in 2020
Poverty rate 6.73%
Men 43.6 · Women 48.3
1920–2026
11,861
2026 projection
5.2% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1920–2026
11,861
2026 projection
5.2% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 11,861 | -103 | 0.86% |
|---|---|---|---|
| 2025 | 11,964 | -97 | 0.80% |
| 2024 | 12,061 | -17 | 0.14% |
| 2023 | 12,078 | -47 | 0.39% |
| 2022 | 12,125 | -130 | 1.06% |
| 2021 | 12,255 | -258 | 2.06% |
| 2020 | 12,513 | -114 | 0.90% |
| 2019 | 12,627 | -146 | 1.14% |
| 2018 | 12,773 | -130 | 1.01% |
| 2017 | 12,903 | -105 | 0.81% |
Showing 10 of 26 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
San Marino has a population change lower than Los Angeles County, California, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 122 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 15 residents
65% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 65% | 68% | 63% |
| Never married | 25% | 28% | 23% |
| Divorced | 4% | 2% | 5% |
| Widowed | 5% | 2% | 9% |
| Separated | <1% | <1% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources