Lake San Marcos, California

Lake San Marcos
Location in San Diego County and the state of California
Lake San Marcos
Location in the United States
Coordinates: 33°7′21″N 117°12′34″W / 33.12250°N 117.20944°W / 33.12250; -117.20944
Country United States
State California
CountySan Diego
Area
 • Total
1.810 sq mi (4.687 km2)
 • Land1.707 sq mi (4.421 km2)
 • Water0.103 sq mi (0.266 km2)  5.68%
Elevation
520 ft (160 m)
Population
 (2020)
 • Total
5,328
 • Density3,121/sq mi (1,205/km2)
Time zoneUTC-8 (PST)
 • Summer (DST)UTC-7 (PDT)
ZIP code
92078
Area codes442/760
FIPS code06-39724
GNIS feature ID1660879

Lake San Marcos is an unincorporated community in the North County region of the San Diego metropolitan area. For statistical purposes, the United States Census Bureau has defined the community as a census-designated place (CDP). Surrounded by the city of San Marcos, the county-governed area receives certain services from the city. As of the 2020 census, Lake San Marcos had a population of 5,328.