| | Villa Park, CA | San Marino, CA | United States |
| Population | 5,864 | 12,620 | 329,725,481 |
| Female Population | 51.2% | 48.6% | 50.5% |
| Male Population | 48.8% | 51.4% | 49.5% |
| Median Age | 50.9 | 45.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,825 | 13,102 | 309,327,143 |
| Population - 2000 | 5,999 | 12,945 | 285,036,114 |
| Population - 1990 | 6,299 | 12,959 | 251,960,433 |
| Pop. 2000 to Now | -3.3% | -1.2% | 15.6% |
| Pop. 1990 to Now | -7.9% | -1.3% | 30.8% |
| space4 | | | |
| Population Density | 2,820.6 | 3,351.9 | 93.4 |
| Land Area | 2.1 | 3.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Villa Park, CA | San Marino, CA | United States |
| Age 0 to 4 | 3.2% | 5.4% | 5.9% |
| Age 5 to 9 | 6.3% | 5.9% | 6.1% |
| Age 10 to 14 | 7.6% | 5.7% | 6.6% |
| Age 15 to 17 | 4.6% | 5.7% | 3.9% |
| Age 18 to 20 | 2.4% | 2.2% | 4.0% |
| Age 21 to 24 | 1.9% | 2.5% | 5.2% |
| Age 25 to 34 | 5.7% | 10.4% | 13.8% |
| Age 35 to 44 | 10.6% | 10.9% | 12.9% |
| Age 45 to 54 | 13.6% | 15.8% | 12.6% |
| Age 55 to 59 | 8.0% | 7.1% | 6.7% |
| Age 60 to 64 | 7.5% | 8.0% | 6.3% |
| Age 65 to 74 | 15.9% | 12.7% | 9.6% |
| Age 75 to 84 | 8.4% | 4.9% | 4.5% |
| Age 85 and over | 4.3% | 2.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Villa Park, CA | San Marino, CA | United States |
| White | 67.3% | 23.7% | 59.4% |
| Black | 0.4% | 0.3% | 12.2% |
| Asian | 14.1% | 66.5% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 2.3% | 3.2% |
| Hispanic | 15.9% | 7.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Villa Park, CA | San Marino, CA | United States |
| Married Population | 68.6% | 65.9% | 49.8% |
| Currently Married | 67.6% | 65.8% | 48.0% |
| Married but Separated | 1.0% | 0.1% | 1.8% |
| Single Population | 31.4% | 34.1% | 50.2% |
| Never Married | 20.4% | 25.6% | 33.8% |
| Divorced | 5.1% | 2.9% | 10.8% |
| Widowed | 5.9% | 5.6% | 5.6% |
| space5 | | | |
| Household Size | 2.96 | 3.17 | 2.60 |
| Households | 1,965 | 3,942 | 124,010,992 |
| Family Households | 1,703 | 3,429 | 80,755,759 |
| Married couple, w/children | 29.7% | 35.7% | 30.5% |
| Married couple, no children | 62.1% | 49.0% | 42.9% |
| Non Family Households | 262 | 513 | 43,255,233 |
| Single householder, w/children | 3.3% | 4.6% | 15.8% |
| Single householder, no children | 5.0% | 10.6% | 10.8% |