| | Fincastle, VA | Wylie, TX | United States |
| Population | 640 | 55,426 | 329,725,481 |
| Female Population | 45.2% | 51.9% | 50.5% |
| Male Population | 54.8% | 48.1% | 49.5% |
| Median Age | 35.8 | 34.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 355 | 42,063 | 309,327,143 |
| Population - 2000 | 359 | 15,132 | 285,036,114 |
| Population - 1990 | 236 | 8,716 | 251,960,433 |
| Pop. 2000 to Now | -5.0% | 260.0% | 15.6% |
| Pop. 1990 to Now | 44.5% | 524.9% | 30.8% |
| space4 | | | |
| Population Density | 2,711.9 | 2,512.9 | 93.4 |
| Land Area | 0.2 | 22.1 | 3,531,905.4 |
| Water Area | 0.0 | 15.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Fincastle, VA | Wylie, TX | United States |
| Age 0 to 4 | 4.1% | 7.4% | 5.9% |
| Age 5 to 9 | 16.7% | 7.6% | 6.1% |
| Age 10 to 14 | 0.6% | 7.8% | 6.6% |
| Age 15 to 17 | 2.0% | 4.9% | 3.9% |
| Age 18 to 20 | 1.4% | 4.5% | 4.0% |
| Age 21 to 24 | 6.4% | 5.5% | 5.2% |
| Age 25 to 34 | 17.2% | 13.7% | 13.8% |
| Age 35 to 44 | 12.0% | 15.8% | 12.9% |
| Age 45 to 54 | 8.8% | 17.2% | 12.6% |
| Age 55 to 59 | 6.4% | 5.2% | 6.7% |
| Age 60 to 64 | 4.1% | 3.2% | 6.3% |
| Age 65 to 74 | 15.2% | 4.8% | 9.6% |
| Age 75 to 84 | 3.9% | 1.9% | 4.5% |
| Age 85 and over | 1.3% | 0.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Fincastle, VA | Wylie, TX | United States |
| White | 88.6% | 54.2% | 59.4% |
| Black | 6.3% | 13.0% | 12.2% |
| Asian | 0.2% | 8.3% | 5.6% |
| Native American | 1.9% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.5% | 0.4% |
| Two or More Races | 1.3% | 4.6% | 3.2% |
| Hispanic | 1.9% | 19.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Fincastle, VA | Wylie, TX | United States |
| Married Population | 46.9% | 57.2% | 49.8% |
| Currently Married | 42.9% | 55.2% | 48.0% |
| Married but Separated | 4.0% | 2.1% | 1.8% |
| Single Population | 53.1% | 42.8% | 50.2% |
| Never Married | 31.0% | 28.6% | 33.8% |
| Divorced | 12.1% | 10.7% | 10.8% |
| Widowed | 9.9% | 3.5% | 5.6% |
| space5 | | | |
| Household Size | 2.18 | 3.12 | 2.60 |
| Households | 239 | 17,710 | 124,010,992 |
| Family Households | 126 | 14,193 | 80,755,759 |
| Married couple, w/children | 20.6% | 48.4% | 30.5% |
| Married couple, no children | 60.3% | 29.7% | 42.9% |
| Non Family Households | 113 | 3,517 | 43,255,233 |
| Single householder, w/children | 12.7% | 14.9% | 15.8% |
| Single householder, no children | 6.3% | 7.0% | 10.8% |