| | Louisa, VA | Keysville, VA | United States |
| Population | 1,999 | 883 | 329,725,481 |
| Female Population | 52.0% | 61.7% | 50.5% |
| Male Population | 48.0% | 38.3% | 49.5% |
| Median Age | 41 | 40.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,561 | 831 | 309,327,143 |
| Population - 2000 | 1,401 | 817 | 285,036,114 |
| Population - 1990 | 1,088 | 606 | 251,960,433 |
| Pop. 2000 to Now | 25.9% | -5.0% | 15.6% |
| Pop. 1990 to Now | 62.1% | 28.1% | 30.8% |
| space4 | | | |
| Population Density | 1,094.1 | 750.9 | 93.4 |
| Land Area | 1.8 | 1.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Louisa, VA | Keysville, VA | United States |
| Age 0 to 4 | 5.3% | 3.6% | 5.9% |
| Age 5 to 9 | 6.3% | 8.8% | 6.1% |
| Age 10 to 14 | 4.9% | 6.5% | 6.6% |
| Age 15 to 17 | 4.5% | 3.6% | 3.9% |
| Age 18 to 20 | 3.1% | 7.8% | 4.0% |
| Age 21 to 24 | 4.7% | 3.6% | 5.2% |
| Age 25 to 34 | 13.2% | 12.5% | 13.8% |
| Age 35 to 44 | 14.7% | 7.0% | 12.9% |
| Age 45 to 54 | 8.8% | 15.1% | 12.6% |
| Age 55 to 59 | 4.8% | 6.0% | 6.7% |
| Age 60 to 64 | 5.6% | 4.6% | 6.3% |
| Age 65 to 74 | 12.5% | 8.3% | 9.6% |
| Age 75 to 84 | 9.5% | 7.9% | 4.5% |
| Age 85 and over | 2.3% | 4.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Louisa, VA | Keysville, VA | United States |
| White | 58.8% | 47.0% | 59.4% |
| Black | 28.3% | 39.2% | 12.2% |
| Asian | 0.7% | 1.4% | 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 | 4.3% | 12.5% | 3.2% |
| Hispanic | 7.9% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Louisa, VA | Keysville, VA | United States |
| Married Population | 39.3% | 29.5% | 49.8% |
| Currently Married | 36.6% | 27.8% | 48.0% |
| Married but Separated | 2.7% | 1.7% | 1.8% |
| Single Population | 60.7% | 70.5% | 50.2% |
| Never Married | 35.4% | 35.9% | 33.8% |
| Divorced | 14.7% | 21.0% | 10.8% |
| Widowed | 10.5% | 13.7% | 5.6% |
| space5 | | | |
| Household Size | 2.14 | 2.00 | 2.60 |
| Households | 888 | 416 | 124,010,992 |
| Family Households | 421 | 191 | 80,755,759 |
| Married couple, w/children | 23.5% | 18.8% | 30.5% |
| Married couple, no children | 38.7% | 34.0% | 42.9% |
| Non Family Households | 467 | 225 | 43,255,233 |
| Single householder, w/children | 28.7% | 30.4% | 15.8% |
| Single householder, no children | 9.0% | 16.8% | 10.8% |