Lake San Marcos

County:: San Diego County
County Seat:: No
Area (mi²):: 1.707
State:: California

Lake San Marcos is a CDP located in San Diego County, California. Lake San Marcos has a 2025 population of 3,991. Lake San Marcos is currently declining at a rate of -0.72% annually but its population has increased by 0.86% since the most recent census, which recorded a population of 3,957 in 2020.

The average household income in Lake San Marcos is $127,344 with a poverty rate of 6.34%.The median age in Lake San Marcos is 60.1 years: 57.2 years for males, and 63.4 years for females.

Demographics

The racial composition of Lake San Marcos includes 68.73% White, 18.98% other race, 5.66% Asian, and smaller percentages for Black or African American and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	3,434	68.73%
Other race	948	18.98%
Asian	283	5.66%
Two or more races	280	5.6%
Black or African American	51	1.02%

Lake San Marcos Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Lake San Marcos' average per capita income is $37,397. Household income levels show a median of $100,676. The poverty rate stands at 6.34%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$116,250	-
Families	$111,688	$151,504
Households	$100,676	$127,344
Non Families	$84,115	$89,130

$37,397

Average Income

$100,676

Median Household Income

6.34%

Poverty Rate