Lake San Marcos is located in California. Lake San Marcos, California has a population of 4,127. Lake San Marcos is less family-centric than the surrounding county with 18.34% of the households containing married families with children. The county average for households married with children is 33.76%.
The median household income in Lake San Marcos, California is $91,308. The median household income for the surrounding county is $88,240 compared to the national median of $69,021. The median age of people living in Lake San Marcos is 63.8 years.
The average high temperature in July is 80.5 degrees, with an average low temperature in January of 45.1 degrees. The average rainfall is approximately 13.4 inches per year, with 0 inches of snow per year.