| | San Geronimo, CA | Los Gatos, CA | United States |
| Population | 292 | 33,309 | 329,725,481 |
| Female Population | 29.1% | 50.9% | 50.5% |
| Male Population | 70.9% | 49.1% | 49.5% |
| Median Age | 47.5 | 46.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 562 | 29,789 | 309,327,143 |
| Population - 2000 | 436 | 28,592 | 285,036,114 |
| Population - 1990 | 434 | 27,357 | 251,960,433 |
| Pop. 2000 to Now | 0.5% | 5.9% | 15.6% |
| Pop. 1990 to Now | 0.9% | 10.6% | 30.8% |
| space4 | | | |
| Population Density | 193.6 | 2,918.0 | 93.4 |
| Land Area | 1.5 | 11.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | San Geronimo, CA | Los Gatos, CA | United States |
| Age 0 to 4 | 0.0% | 3.4% | 5.9% |
| Age 5 to 9 | 0.0% | 5.6% | 6.1% |
| Age 10 to 14 | 0.0% | 8.6% | 6.6% |
| Age 15 to 17 | 7.2% | 4.8% | 3.9% |
| Age 18 to 20 | 14.4% | 2.5% | 4.0% |
| Age 21 to 24 | 0.0% | 2.4% | 5.2% |
| Age 25 to 34 | 5.1% | 7.6% | 13.8% |
| Age 35 to 44 | 9.2% | 12.0% | 12.9% |
| Age 45 to 54 | 21.2% | 18.0% | 12.6% |
| Age 55 to 59 | 0.0% | 8.1% | 6.7% |
| Age 60 to 64 | 0.0% | 6.9% | 6.3% |
| Age 65 to 74 | 27.4% | 9.8% | 9.6% |
| Age 75 to 84 | 7.5% | 6.5% | 4.5% |
| Age 85 and over | 7.9% | 3.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | San Geronimo, CA | Los Gatos, CA | United States |
| White | 88.4% | 70.1% | 59.4% |
| Black | 0.0% | 0.8% | 12.2% |
| Asian | 0.0% | 16.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 0.0% | 3.9% | 3.2% |
| Hispanic | 11.6% | 8.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | San Geronimo, CA | Los Gatos, CA | United States |
| Married Population | 49.0% | 64.1% | 49.8% |
| Currently Married | 49.0% | 62.4% | 48.0% |
| Married but Separated | 0.0% | 1.7% | 1.8% |
| Single Population | 51.0% | 35.9% | 50.2% |
| Never Married | 38.7% | 22.2% | 33.8% |
| Divorced | 12.3% | 8.2% | 10.8% |
| Widowed | 0.0% | 5.5% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 2.53 | 2.60 |
| Households | 130 | 13,036 | 124,010,992 |
| Family Households | 71 | 9,279 | 80,755,759 |
| Married couple, w/children | 28.2% | 39.9% | 30.5% |
| Married couple, no children | 71.8% | 46.7% | 42.9% |
| Non Family Households | 59 | 3,757 | 43,255,233 |
| Single householder, w/children | 0.0% | 5.6% | 15.8% |
| Single householder, no children | 0.0% | 7.8% | 10.8% |