| | Stillwater, NJ | Walhalla, SC | United States |
| Population | 3,988 | 4,076 | 329,725,481 |
| Female Population | 46.4% | 56.2% | 50.5% |
| Male Population | 53.6% | 43.8% | 49.5% |
| Median Age | 52.3 | 40.6 | 38.4 |
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| Population - 2010 | 4,150 | 4,228 | 309,327,143 |
| Population - 2000 | 4,267 | 3,801 | 285,036,114 |
| Population - 1990 | 4,253 | 3,755 | 251,960,433 |
| Pop. 2000 to Now | -9.7% | 17.3% | 15.6% |
| Pop. 1990 to Now | -9.4% | 18.8% | 30.8% |
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| Population Density | 149.6 | 1,049.2 | 93.4 |
| Land Area | 26.7 | 3.9 | 3,531,905.4 |
| Water Area | 1.3 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Stillwater, NJ | Walhalla, SC | United States |
| Age 0 to 4 | 2.4% | 3.7% | 5.9% |
| Age 5 to 9 | 3.8% | 5.5% | 6.1% |
| Age 10 to 14 | 3.1% | 6.4% | 6.6% |
| Age 15 to 17 | 3.9% | 4.0% | 3.9% |
| Age 18 to 20 | 4.2% | 1.5% | 4.0% |
| Age 21 to 24 | 2.9% | 3.8% | 5.2% |
| Age 25 to 34 | 13.4% | 19.1% | 13.8% |
| Age 35 to 44 | 4.8% | 12.0% | 12.9% |
| Age 45 to 54 | 19.0% | 12.5% | 12.6% |
| Age 55 to 59 | 12.3% | 7.6% | 6.7% |
| Age 60 to 64 | 4.3% | 4.6% | 6.3% |
| Age 65 to 74 | 16.3% | 9.6% | 9.6% |
| Age 75 to 84 | 8.7% | 6.2% | 4.5% |
| Age 85 and over | 1.0% | 3.5% | 1.9% |
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| Race | | | |
| | Stillwater, NJ | Walhalla, SC | United States |
| White | 96.5% | 77.8% | 59.4% |
| Black | 0.0% | 3.8% | 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 | 1.1% | 0.0% | 0.4% |
| Two or More Races | 0.2% | 2.0% | 3.2% |
| Hispanic | 2.2% | 16.4% | 18.4% |
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| Marriage & Family | | | |
| | Stillwater, NJ | Walhalla, SC | United States |
| Married Population | 57.4% | 51.0% | 49.8% |
| Currently Married | 54.9% | 45.4% | 48.0% |
| Married but Separated | 2.5% | 5.6% | 1.8% |
| Single Population | 42.6% | 49.0% | 50.2% |
| Never Married | 28.1% | 30.9% | 33.8% |
| Divorced | 12.1% | 10.2% | 10.8% |
| Widowed | 2.4% | 7.9% | 5.6% |
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| Household Size | 2.53 | 2.28 | 2.60 |
| Households | 1,574 | 1,719 | 124,010,992 |
| Family Households | 1,220 | 1,283 | 80,755,759 |
| Married couple, w/children | 12.6% | 18.9% | 30.5% |
| Married couple, no children | 63.6% | 35.9% | 42.9% |
| Non Family Households | 354 | 436 | 43,255,233 |
| Single householder, w/children | 9.7% | 22.4% | 15.8% |
| Single householder, no children | 14.1% | 22.8% | 10.8% |