Unified School District · CA
San Marcos Unified School District
San Marcos Unified School District is a unified school district in California with a community population of 127,375. The median household income is $112,358 and the median age is 38.2.
127,375
Population
3059
People / sq mi
$112,358
Median Income
38.2
Median Age
San Marcos Unified School District covers 42 sq mi of land at 3059.0 people per square mile.
Race & Ethnicity
| White | 53.0% |
| Black or African American | 0.1% |
| Asian | 39.2% |
| Hispanic or Latino (any race) | 0.0% |
Economy & Income
$112,358
Median Household Income
$50,865
Per Capita Income
6.6%
Poverty Rate
3.2%
Unemployment
Housing
$895,200
Median Home Value
$2,373
Median Rent
64.3%
Homeownership
Education Attainment
88.7%
High School+
44.9%
Bachelor's+
Other California School Districts
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State rankings
Frequently Asked Questions
San Marcos Unified School District serves a community with a population of 127,375 according to the latest Census ACS 5-Year estimates. This unified school district is located in California.
The median household income in San Marcos Unified School District is $112,358, with a per capita income of $50,865. The poverty rate is 6.6%.
San Marcos Unified School District is 53.0% White, 0.1% Black or African American, 39.2% Asian, and 0.0% Hispanic or Latino, per Census ACS data.
In San Marcos Unified School District, 88.7% of adults have a high school diploma or higher, and 44.9% hold a bachelor's degree or higher, per Census ACS estimates.
The median home value in San Marcos Unified School District is $895,200, with a median rent of $2,373. The homeownership rate is 64.3%.
More from California
Data for San Marcos Unified School District from the American Community Survey 5-Year estimates. Land area from Census Gazetteer files. This is a unified school district (GEOID: 0634880).
The this entity record above pulls directly from the U.S. Census Bureau ACS and decennial files. What follows is the per-entity context — how this entity sits in the broader U.S. population demographics distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the the U.S. Census Bureau ACS and decennial files portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. states, metros, cities, and ZIPs with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: U.S. Census Bureau ACS, 2026.