| | Byrdstown, TN | Vermilion, OH | United States |
| Population | 1,278 | 10,560 | 329,725,481 |
| Female Population | 41.5% | 51.4% | 50.5% |
| Male Population | 58.5% | 48.6% | 49.5% |
| Median Age | 40.5 | 47.5 | 38.4 |
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| Population - 2010 | 810 | 10,668 | 309,327,143 |
| Population - 2000 | 903 | 10,927 | 285,036,114 |
| Population - 1990 | 998 | 11,127 | 251,960,433 |
| Pop. 2000 to Now | -12.3% | -4.2% | 15.6% |
| Pop. 1990 to Now | -20.6% | -5.9% | 30.8% |
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| Population Density | 893.1 | 992.9 | 93.4 |
| Land Area | 1.4 | 10.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Byrdstown, TN | Vermilion, OH | United States |
| Age 0 to 4 | 5.9% | 5.4% | 5.9% |
| Age 5 to 9 | 9.9% | 4.9% | 6.1% |
| Age 10 to 14 | 11.3% | 4.9% | 6.6% |
| Age 15 to 17 | 1.6% | 4.9% | 3.9% |
| Age 18 to 20 | 4.3% | 2.2% | 4.0% |
| Age 21 to 24 | 4.3% | 2.7% | 5.2% |
| Age 25 to 34 | 4.9% | 10.4% | 13.8% |
| Age 35 to 44 | 15.0% | 10.3% | 12.9% |
| Age 45 to 54 | 9.1% | 15.2% | 12.6% |
| Age 55 to 59 | 8.6% | 10.8% | 6.7% |
| Age 60 to 64 | 4.5% | 6.5% | 6.3% |
| Age 65 to 74 | 12.4% | 13.3% | 9.6% |
| Age 75 to 84 | 7.7% | 4.6% | 4.5% |
| Age 85 and over | 0.6% | 3.8% | 1.9% |
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| Race | | | |
| | Byrdstown, TN | Vermilion, OH | United States |
| White | 95.0% | 93.9% | 59.4% |
| Black | 0.4% | 0.1% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.0% | 1.1% | 3.2% |
| Hispanic | 0.6% | 4.2% | 18.4% |
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| Marriage & Family | | | |
| | Byrdstown, TN | Vermilion, OH | United States |
| Married Population | 44.6% | 54.2% | 49.8% |
| Currently Married | 41.2% | 52.5% | 48.0% |
| Married but Separated | 3.4% | 1.7% | 1.8% |
| Single Population | 55.4% | 45.8% | 50.2% |
| Never Married | 27.5% | 26.9% | 33.8% |
| Divorced | 17.7% | 11.1% | 10.8% |
| Widowed | 10.2% | 7.8% | 5.6% |
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| Household Size | 2.63 | 2.33 | 2.60 |
| Households | 460 | 4,464 | 124,010,992 |
| Family Households | 238 | 2,809 | 80,755,759 |
| Married couple, w/children | 35.3% | 31.2% | 30.5% |
| Married couple, no children | 38.7% | 48.2% | 42.9% |
| Non Family Households | 222 | 1,655 | 43,255,233 |
| Single householder, w/children | 21.8% | 11.3% | 15.8% |
| Single householder, no children | 4.2% | 9.3% | 10.8% |