Lake San Marcos CDP, California Demographics & Population 2026

Population Overview

Lake San Marcos CDP is a small community located in California. The total population is 4,996. It ranks as the 662nd most populous out of 1,577 cities and towns in California.

Age Demographics

The median age in Lake San Marcos CDP is 60.1 years. This is 60% higher than the state median of 37.6 years. Only 11.2% of residents are under 18, indicating fewer families with children. 20.6% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Lake San Marcos CDP is $100,676. This is 5% higher than the state median of $96,334. Compared to the national median of $78,538, household income here is 28% higher. The poverty rate stands at 6.3%. This is 47% lower than the state poverty rate of 12.0%. The unemployment rate is 3.4%. This is 47% lower than the state rate of 6.4%. The median home value is $859,600. Housing costs are 24% higher than the state median of $695,400. The home-value-to-income ratio of 8.5x suggests that housing affordability is a significant concern for many residents. 78.4% of occupied housing units are owner-occupied. This homeownership rate is 41% higher than the state average of 55.8%.

Race & Ethnicity

The largest racial or ethnic group in Lake San Marcos CDP is White (non-Hispanic), making up 67.4% of the population. Hispanic or Latino residents account for 21.6%. The White (non-Hispanic) population is significantly higher than the state average (67.4% vs 34.6%). The Black or African American population (1.0%) is well below the state average of 5.3%. The Asian population (5.7%) is well below the state average of 15.0%.

Education

35.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 3% lower than the state rate of 36.5%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 87.4%.

Data Sources & Methodology

All demographic data for Lake San Marcos CDP, California is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against California state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,577 Census-designated places in California. For official data, visit data.census.gov.