| | Buffalo Gap, SD | Argyle, NY | United States |
| Population | 120 | 3,666 | 329,725,481 |
| Female Population | 40.8% | 51.1% | 50.5% |
| Male Population | 59.2% | 48.9% | 49.5% |
| Median Age | 64.8 | 48.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 128 | 3,792 | 309,327,143 |
| Population - 2000 | 164 | 3,688 | 285,036,114 |
| Population - 1990 | 173 | 3,031 | 251,960,433 |
| Pop. 2000 to Now | -12.2% | -1.4% | 15.6% |
| Pop. 1990 to Now | -16.8% | 20.0% | 30.8% |
| space4 | | | |
| Population Density | 392.2 | 64.8 | 93.4 |
| Land Area | 0.3 | 56.5 | 3,531,905.4 |
| Water Area | 0.0 | 1.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Buffalo Gap, SD | Argyle, NY | United States |
| Age 0 to 4 | 6.7% | 4.4% | 5.9% |
| Age 5 to 9 | 1.7% | 6.3% | 6.1% |
| Age 10 to 14 | 2.5% | 4.9% | 6.6% |
| Age 15 to 17 | 0.0% | 5.0% | 3.9% |
| Age 18 to 20 | 3.3% | 0.8% | 4.0% |
| Age 21 to 24 | 0.0% | 3.0% | 5.2% |
| Age 25 to 34 | 3.3% | 10.0% | 13.8% |
| Age 35 to 44 | 2.5% | 12.2% | 12.9% |
| Age 45 to 54 | 5.0% | 15.4% | 12.6% |
| Age 55 to 59 | 12.5% | 8.6% | 6.7% |
| Age 60 to 64 | 13.3% | 5.7% | 6.3% |
| Age 65 to 74 | 25.8% | 14.8% | 9.6% |
| Age 75 to 84 | 23.3% | 7.4% | 4.5% |
| Age 85 and over | 0.0% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Buffalo Gap, SD | Argyle, NY | United States |
| White | 98.3% | 96.4% | 59.4% |
| Black | 0.0% | 0.1% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.8% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 0.8% | 1.0% | 3.2% |
| Hispanic | 0.0% | 1.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Buffalo Gap, SD | Argyle, NY | United States |
| Married Population | 45.8% | 56.6% | 49.8% |
| Currently Married | 41.1% | 56.0% | 48.0% |
| Married but Separated | 4.7% | 0.6% | 1.8% |
| Single Population | 54.2% | 43.4% | 50.2% |
| Never Married | 7.5% | 22.9% | 33.8% |
| Divorced | 26.2% | 13.9% | 10.8% |
| Widowed | 20.6% | 6.6% | 5.6% |
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| Household Size | 1.74 | 2.39 | 2.60 |
| Households | 69 | 1,482 | 124,010,992 |
| Family Households | 32 | 937 | 80,755,759 |
| Married couple, w/children | 6.3% | 32.6% | 30.5% |
| Married couple, no children | 59.4% | 55.5% | 42.9% |
| Non Family Households | 37 | 545 | 43,255,233 |
| Single householder, w/children | 6.3% | 10.1% | 15.8% |
| Single householder, no children | 28.1% | 1.8% | 10.8% |