| | Clarksville, MO | Scottsville, VA | United States |
| Population | 533 | 624 | 329,725,481 |
| Female Population | 49.3% | 55.9% | 50.5% |
| Male Population | 50.7% | 44.1% | 49.5% |
| Median Age | 49.8 | 40.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 449 | 567 | 309,327,143 |
| Population - 2000 | 490 | 555 | 285,036,114 |
| Population - 1990 | 480 | 239 | 251,960,433 |
| Pop. 2000 to Now | -11.4% | 12.6% | 15.6% |
| Pop. 1990 to Now | -9.6% | 161.5% | 30.8% |
| space4 | | | |
| Population Density | 917.4 | 409.5 | 93.4 |
| Land Area | 0.6 | 1.5 | 3,531,905.4 |
| Water Area | 0.4 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Clarksville, MO | Scottsville, VA | United States |
| Age 0 to 4 | 4.5% | 6.4% | 5.9% |
| Age 5 to 9 | 1.5% | 7.7% | 6.1% |
| Age 10 to 14 | 9.4% | 9.0% | 6.6% |
| Age 15 to 17 | 8.1% | 4.3% | 3.9% |
| Age 18 to 20 | 2.8% | 0.2% | 4.0% |
| Age 21 to 24 | 1.5% | 0.5% | 5.2% |
| Age 25 to 34 | 11.8% | 13.6% | 13.8% |
| Age 35 to 44 | 9.9% | 12.3% | 12.9% |
| Age 45 to 54 | 6.0% | 9.8% | 12.6% |
| Age 55 to 59 | 7.7% | 6.3% | 6.7% |
| Age 60 to 64 | 5.8% | 7.9% | 6.3% |
| Age 65 to 74 | 26.1% | 16.0% | 9.6% |
| Age 75 to 84 | 4.9% | 3.8% | 4.5% |
| Age 85 and over | 0.0% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Clarksville, MO | Scottsville, VA | United States |
| White | 95.7% | 75.5% | 59.4% |
| Black | 3.4% | 24.2% | 12.2% |
| Asian | 0.0% | 0.0% | 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 | 0.0% | 0.3% | 3.2% |
| Hispanic | 0.9% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Clarksville, MO | Scottsville, VA | United States |
| Married Population | 47.7% | 46.3% | 49.8% |
| Currently Married | 47.0% | 42.3% | 48.0% |
| Married but Separated | 0.7% | 4.0% | 1.8% |
| Single Population | 52.3% | 53.8% | 50.2% |
| Never Married | 25.3% | 30.0% | 33.8% |
| Divorced | 21.1% | 19.0% | 10.8% |
| Widowed | 6.0% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.44 | 2.35 | 2.60 |
| Households | 218 | 266 | 124,010,992 |
| Family Households | 150 | 149 | 80,755,759 |
| Married couple, w/children | 7.3% | 24.8% | 30.5% |
| Married couple, no children | 58.7% | 42.3% | 42.9% |
| Non Family Households | 68 | 117 | 43,255,233 |
| Single householder, w/children | 25.3% | 29.5% | 15.8% |
| Single householder, no children | 8.7% | 3.4% | 10.8% |