| | Amherst, VA | Warrenville, IL | United States |
| Population | 2,504 | 13,738 | 329,725,481 |
| Female Population | 50.4% | 51.3% | 50.5% |
| Male Population | 49.6% | 48.7% | 49.5% |
| Median Age | 51 | 37.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,232 | 13,184 | 309,327,143 |
| Population - 2000 | 2,251 | 13,363 | 285,036,114 |
| Population - 1990 | 1,060 | 11,333 | 251,960,433 |
| Pop. 2000 to Now | -3.1% | 0.7% | 15.6% |
| Pop. 1990 to Now | 105.9% | 18.7% | 30.8% |
| space4 | | | |
| Population Density | 510.8 | 2,524.9 | 93.4 |
| Land Area | 4.9 | 5.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Amherst, VA | Warrenville, IL | United States |
| Age 0 to 4 | 2.8% | 3.5% | 5.9% |
| Age 5 to 9 | 3.0% | 7.5% | 6.1% |
| Age 10 to 14 | 7.7% | 6.1% | 6.6% |
| Age 15 to 17 | 2.6% | 5.2% | 3.9% |
| Age 18 to 20 | 1.7% | 3.6% | 4.0% |
| Age 21 to 24 | 3.0% | 4.5% | 5.2% |
| Age 25 to 34 | 13.6% | 14.5% | 13.8% |
| Age 35 to 44 | 10.8% | 14.3% | 12.9% |
| Age 45 to 54 | 13.1% | 12.7% | 12.6% |
| Age 55 to 59 | 4.1% | 7.1% | 6.7% |
| Age 60 to 64 | 6.6% | 6.2% | 6.3% |
| Age 65 to 74 | 15.4% | 9.9% | 9.6% |
| Age 75 to 84 | 11.7% | 4.0% | 4.5% |
| Age 85 and over | 3.8% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Amherst, VA | Warrenville, IL | United States |
| White | 70.4% | 66.5% | 59.4% |
| Black | 20.3% | 5.1% | 12.2% |
| Asian | 0.2% | 5.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.6% | 1.8% | 3.2% |
| Hispanic | 8.4% | 21.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Amherst, VA | Warrenville, IL | United States |
| Married Population | 50.4% | 50.9% | 49.8% |
| Currently Married | 46.4% | 49.7% | 48.0% |
| Married but Separated | 4.1% | 1.3% | 1.8% |
| Single Population | 49.6% | 49.1% | 50.2% |
| Never Married | 23.3% | 34.9% | 33.8% |
| Divorced | 12.5% | 10.3% | 10.8% |
| Widowed | 13.8% | 3.9% | 5.6% |
| space5 | | | |
| Household Size | 2.05 | 2.61 | 2.60 |
| Households | 1,138 | 5,214 | 124,010,992 |
| Family Households | 637 | 3,411 | 80,755,759 |
| Married couple, w/children | 21.0% | 32.0% | 30.5% |
| Married couple, no children | 56.2% | 44.9% | 42.9% |
| Non Family Households | 501 | 1,803 | 43,255,233 |
| Single householder, w/children | 14.6% | 15.1% | 15.8% |
| Single householder, no children | 8.2% | 8.1% | 10.8% |