| | Allenwood, PA | Lorton, VA | United States |
| Population | 219 | 21,394 | 329,725,481 |
| Female Population | 44.8% | 53.2% | 50.5% |
| Male Population | 55.3% | 46.8% | 49.5% |
| Median Age | 42.5 | 37.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 523 | 19,262 | 309,327,143 |
| Population - 2000 | 1,220 | 17,786 | 285,036,114 |
| Population - 1990 | 290 | 15,385 | 251,960,433 |
| Pop. 2000 to Now | -72.5% | 14.9% | 15.6% |
| Pop. 1990 to Now | 15.9% | 32.9% | 30.8% |
| space4 | | | |
| Population Density | 372.5 | 4,003.4 | 93.4 |
| Land Area | 0.6 | 5.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Allenwood, PA | Lorton, VA | United States |
| Age 0 to 4 | 5.9% | 6.1% | 5.9% |
| Age 5 to 9 | 3.7% | 5.1% | 6.1% |
| Age 10 to 14 | 5.5% | 11.4% | 6.6% |
| Age 15 to 17 | 2.3% | 6.6% | 3.9% |
| Age 18 to 20 | 0.5% | 4.4% | 4.0% |
| Age 21 to 24 | 4.1% | 3.9% | 5.2% |
| Age 25 to 34 | 21.0% | 8.9% | 13.8% |
| Age 35 to 44 | 9.1% | 16.7% | 12.9% |
| Age 45 to 54 | 12.3% | 16.4% | 12.6% |
| Age 55 to 59 | 7.8% | 4.9% | 6.7% |
| Age 60 to 64 | 5.5% | 5.4% | 6.3% |
| Age 65 to 74 | 16.0% | 6.1% | 9.6% |
| Age 75 to 84 | 4.1% | 2.6% | 4.5% |
| Age 85 and over | 2.3% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Allenwood, PA | Lorton, VA | United States |
| White | 100.0% | 27.0% | 59.4% |
| Black | 0.0% | 29.4% | 12.2% |
| Asian | 0.0% | 18.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.5% | 0.4% |
| Two or More Races | 0.0% | 4.5% | 3.2% |
| Hispanic | 0.0% | 19.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Allenwood, PA | Lorton, VA | United States |
| Married Population | 60.8% | 55.1% | 49.8% |
| Currently Married | 60.8% | 53.4% | 48.0% |
| Married but Separated | 0.0% | 1.7% | 1.8% |
| Single Population | 39.2% | 44.9% | 50.2% |
| Never Married | 28.5% | 33.5% | 33.8% |
| Divorced | 9.1% | 7.4% | 10.8% |
| Widowed | 1.6% | 4.1% | 5.6% |
| space5 | | | |
| Household Size | 2.70 | 3.28 | 2.60 |
| Households | 81 | 6,496 | 124,010,992 |
| Family Households | 62 | 5,029 | 80,755,759 |
| Married couple, w/children | 30.6% | 50.0% | 30.5% |
| Married couple, no children | 59.7% | 26.6% | 42.9% |
| Non Family Households | 19 | 1,467 | 43,255,233 |
| Single householder, w/children | 0.0% | 15.5% | 15.8% |
| Single householder, no children | 9.7% | 7.9% | 10.8% |