| | Gettysburg, SD | Clinton, SC | United States |
| Population | 1,464 | 7,753 | 329,725,481 |
| Female Population | 50.6% | 53.6% | 50.5% |
| Male Population | 49.5% | 46.4% | 49.5% |
| Median Age | 45 | 37.5 | 38.4 |
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| Population - 2010 | 1,186 | 8,463 | 309,327,143 |
| Population - 2000 | 1,352 | 8,091 | 285,036,114 |
| Population - 1990 | 1,510 | 8,972 | 251,960,433 |
| Pop. 2000 to Now | -19.8% | 2.6% | 15.6% |
| Pop. 1990 to Now | -28.2% | -7.5% | 30.8% |
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| Population Density | 762.1 | 771.5 | 93.4 |
| Land Area | 1.9 | 10.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Gettysburg, SD | Clinton, SC | United States |
| Age 0 to 4 | 4.2% | 2.9% | 5.9% |
| Age 5 to 9 | 8.8% | 4.4% | 6.1% |
| Age 10 to 14 | 4.4% | 7.9% | 6.6% |
| Age 15 to 17 | 5.7% | 5.3% | 3.9% |
| Age 18 to 20 | 2.9% | 10.4% | 4.0% |
| Age 21 to 24 | 5.4% | 6.2% | 5.2% |
| Age 25 to 34 | 9.3% | 10.4% | 13.8% |
| Age 35 to 44 | 9.4% | 11.2% | 12.9% |
| Age 45 to 54 | 8.4% | 10.6% | 12.6% |
| Age 55 to 59 | 6.8% | 4.9% | 6.7% |
| Age 60 to 64 | 8.0% | 3.7% | 6.3% |
| Age 65 to 74 | 11.3% | 10.4% | 9.6% |
| Age 75 to 84 | 11.0% | 5.8% | 4.5% |
| Age 85 and over | 4.6% | 5.9% | 1.9% |
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| Race | | | |
| | Gettysburg, SD | Clinton, SC | United States |
| White | 86.9% | 62.4% | 59.4% |
| Black | 0.3% | 29.3% | 12.2% |
| Asian | 3.1% | 1.5% | 5.6% |
| Native American | 5.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 4.2% | 5.4% | 3.2% |
| Hispanic | 0.0% | 1.5% | 18.4% |
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| Marriage & Family | | | |
| | Gettysburg, SD | Clinton, SC | United States |
| Married Population | 52.8% | 26.1% | 49.8% |
| Currently Married | 52.2% | 23.5% | 48.0% |
| Married but Separated | 0.6% | 2.6% | 1.8% |
| Single Population | 47.2% | 73.9% | 50.2% |
| Never Married | 26.0% | 49.6% | 33.8% |
| Divorced | 10.1% | 11.2% | 10.8% |
| Widowed | 11.1% | 13.2% | 5.6% |
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| Household Size | 2.30 | 2.40 | 2.60 |
| Households | 620 | 2,596 | 124,010,992 |
| Family Households | 353 | 1,256 | 80,755,759 |
| Married couple, w/children | 37.4% | 24.7% | 30.5% |
| Married couple, no children | 51.0% | 27.0% | 42.9% |
| Non Family Households | 267 | 1,340 | 43,255,233 |
| Single householder, w/children | 5.9% | 21.3% | 15.8% |
| Single householder, no children | 5.7% | 27.0% | 10.8% |