| City : | Lake San Marcos |
| County : | San Diego County |
| State : | California (CA) |
| | |
| Land Area : | 1.72 sq mi |
| Water Area : | 0.09 sq mi |
| Latitude : | 33.1223615 |
| Longitude : | -117.2085756 |
| | |
| Population (2010): | 4,437 |
| Population Estimate (2012) : | 4,555 |
| Population Density : | 2,578.66/sq mi |
| Housing Units (2012) : | 2,533 |
| Median Household Income (2012) : | $43,766 (California : $61,400, USA : $53,046) |
| Median Family Income (2012) : | $65,163 (California : $69,883, USA : $64,585) |
| Median House Price (2012) : | $447,300 (California : $383,900, USA : $181,400) |