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, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Other race

Asian

Two or more races

Black or African American

Native American

Native Hawaiian or Pacific Islander

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%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%

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