| | Mount Vernon, VA | Woodbridge, VA | United States |
| Population | 13,707 | 42,734 | 329,725,481 |
| Female Population | 52.4% | 52.0% | 50.5% |
| Male Population | 47.6% | 48.0% | 49.5% |
| Median Age | 42.8 | 33.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,753 | 3,984 | 309,327,143 |
| Population - 2000 | 28,582 | 31,941 | 285,036,114 |
| Population - 1990 | 27,485 | 26,401 | 251,960,433 |
| Pop. 2000 to Now | -55.4% | -85.4% | 15.6% |
| Pop. 1990 to Now | -53.6% | -82.3% | 30.8% |
| space4 | | | |
| Population Density | 2,623.4 | 26,692.1 | 93.4 |
| Land Area | 5.2 | 1.6 | 3,531,905.4 |
| Water Area | 0.8 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mount Vernon, VA | Woodbridge, VA | United States |
| Age 0 to 4 | 7.6% | 7.4% | 5.9% |
| Age 5 to 9 | 6.4% | 9.0% | 6.1% |
| Age 10 to 14 | 6.6% | 5.7% | 6.6% |
| Age 15 to 17 | 4.4% | 3.4% | 3.9% |
| Age 18 to 20 | 1.7% | 3.9% | 4.0% |
| Age 21 to 24 | 3.7% | 7.0% | 5.2% |
| Age 25 to 34 | 9.7% | 16.1% | 13.8% |
| Age 35 to 44 | 12.5% | 14.8% | 12.9% |
| Age 45 to 54 | 17.3% | 13.0% | 12.6% |
| Age 55 to 59 | 6.9% | 5.7% | 6.7% |
| Age 60 to 64 | 6.4% | 4.6% | 6.3% |
| Age 65 to 74 | 9.4% | 6.6% | 9.6% |
| Age 75 to 84 | 4.6% | 1.9% | 4.5% |
| Age 85 and over | 2.7% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mount Vernon, VA | Woodbridge, VA | United States |
| White | 54.9% | 21.2% | 59.4% |
| Black | 14.7% | 21.9% | 12.2% |
| Asian | 6.4% | 9.4% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.5% | 0.6% | 0.4% |
| Two or More Races | 5.5% | 4.2% | 3.2% |
| Hispanic | 17.8% | 42.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mount Vernon, VA | Woodbridge, VA | United States |
| Married Population | 61.9% | 49.3% | 49.8% |
| Currently Married | 60.0% | 45.3% | 48.0% |
| Married but Separated | 1.9% | 4.0% | 1.8% |
| Single Population | 38.1% | 50.7% | 50.2% |
| Never Married | 23.5% | 36.3% | 33.8% |
| Divorced | 8.8% | 10.4% | 10.8% |
| Widowed | 5.8% | 4.0% | 5.6% |
| space5 | | | |
| Household Size | 2.83 | 3.08 | 2.60 |
| Households | 4,847 | 13,847 | 124,010,992 |
| Family Households | 3,597 | 9,528 | 80,755,759 |
| Married couple, w/children | 36.3% | 37.6% | 30.5% |
| Married couple, no children | 45.5% | 29.1% | 42.9% |
| Non Family Households | 1,250 | 4,319 | 43,255,233 |
| Single householder, w/children | 11.1% | 19.6% | 15.8% |
| Single householder, no children | 7.1% | 13.7% | 10.8% |