| | New Castle, KY | Williston, SC | United States |
| Population | 819 | 2,909 | 329,725,481 |
| Female Population | 54.8% | 45.9% | 50.5% |
| Male Population | 45.2% | 54.1% | 49.5% |
| Median Age | 52.7 | 45.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 906 | 3,144 | 309,327,143 |
| Population - 2000 | 919 | 3,307 | 285,036,114 |
| Population - 1990 | 893 | 3,099 | 251,960,433 |
| Pop. 2000 to Now | 1.2% | -11.9% | 15.6% |
| Pop. 1990 to Now | 4.1% | -6.0% | 30.8% |
| space4 | | | |
| Population Density | 1,997.6 | 324.9 | 93.4 |
| Land Area | 0.4 | 9.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | New Castle, KY | Williston, SC | United States |
| Age 0 to 4 | 4.9% | 4.0% | 5.9% |
| Age 5 to 9 | 3.4% | 8.5% | 6.1% |
| Age 10 to 14 | 4.8% | 5.1% | 6.6% |
| Age 15 to 17 | 1.1% | 9.0% | 3.9% |
| Age 18 to 20 | 3.9% | 1.9% | 4.0% |
| Age 21 to 24 | 2.2% | 3.7% | 5.2% |
| Age 25 to 34 | 12.3% | 10.8% | 13.8% |
| Age 35 to 44 | 4.2% | 6.8% | 12.9% |
| Age 45 to 54 | 15.4% | 16.6% | 12.6% |
| Age 55 to 59 | 6.2% | 15.7% | 6.7% |
| Age 60 to 64 | 7.3% | 2.2% | 6.3% |
| Age 65 to 74 | 16.2% | 9.7% | 9.6% |
| Age 75 to 84 | 8.9% | 1.9% | 4.5% |
| Age 85 and over | 9.2% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | New Castle, KY | Williston, SC | United States |
| White | 90.5% | 47.9% | 59.4% |
| Black | 4.3% | 51.8% | 12.2% |
| Asian | 0.6% | 0.0% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 0.1% | 3.2% |
| Hispanic | 2.0% | 0.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | New Castle, KY | Williston, SC | United States |
| Married Population | 46.6% | 33.4% | 49.8% |
| Currently Married | 42.1% | 31.8% | 48.0% |
| Married but Separated | 4.5% | 1.6% | 1.8% |
| Single Population | 53.4% | 66.6% | 50.2% |
| Never Married | 20.5% | 37.0% | 33.8% |
| Divorced | 14.9% | 15.9% | 10.8% |
| Widowed | 18.0% | 13.7% | 5.6% |
| space5 | | | |
| Household Size | 2.03 | 2.10 | 2.60 |
| Households | 367 | 1,354 | 124,010,992 |
| Family Households | 184 | 692 | 80,755,759 |
| Married couple, w/children | 22.3% | 20.5% | 30.5% |
| Married couple, no children | 55.4% | 24.7% | 42.9% |
| Non Family Households | 183 | 662 | 43,255,233 |
| Single householder, w/children | 13.0% | 30.8% | 15.8% |
| Single householder, no children | 9.2% | 24.0% | 10.8% |