| | Wilmot, SD | Estelline, SD | United States |
| Population | 499 | 843 | 329,725,481 |
| Female Population | 50.7% | 49.8% | 50.5% |
| Male Population | 49.3% | 50.2% | 49.5% |
| Median Age | 55.1 | 33.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 498 | 769 | 309,327,143 |
| Population - 2000 | 543 | 675 | 285,036,114 |
| Population - 1990 | 566 | 658 | 251,960,433 |
| Pop. 2000 to Now | -8.5% | 10.2% | 15.6% |
| Pop. 1990 to Now | -12.2% | 13.1% | 30.8% |
| space4 | | | |
| Population Density | 936.2 | 892.1 | 93.4 |
| Land Area | 0.5 | 0.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Wilmot, SD | Estelline, SD | United States |
| Age 0 to 4 | 3.0% | 11.2% | 5.9% |
| Age 5 to 9 | 3.2% | 8.1% | 6.1% |
| Age 10 to 14 | 8.6% | 7.0% | 6.6% |
| Age 15 to 17 | 4.8% | 5.6% | 3.9% |
| Age 18 to 20 | 0.0% | 2.0% | 4.0% |
| Age 21 to 24 | 7.0% | 3.1% | 5.2% |
| Age 25 to 34 | 7.4% | 14.8% | 13.8% |
| Age 35 to 44 | 6.6% | 13.4% | 12.9% |
| Age 45 to 54 | 9.0% | 11.9% | 12.6% |
| Age 55 to 59 | 4.0% | 6.6% | 6.7% |
| Age 60 to 64 | 7.6% | 2.7% | 6.3% |
| Age 65 to 74 | 17.4% | 7.8% | 9.6% |
| Age 75 to 84 | 13.8% | 3.8% | 4.5% |
| Age 85 and over | 7.4% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Wilmot, SD | Estelline, SD | United States |
| White | 84.2% | 89.4% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.5% | 5.6% |
| Native American | 2.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.4% | 6.1% | 3.2% |
| Hispanic | 8.2% | 4.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Wilmot, SD | Estelline, SD | United States |
| Married Population | 51.8% | 45.0% | 49.8% |
| Currently Married | 50.6% | 44.1% | 48.0% |
| Married but Separated | 1.2% | 1.0% | 1.8% |
| Single Population | 48.2% | 55.0% | 50.2% |
| Never Married | 27.3% | 27.8% | 33.8% |
| Divorced | 4.7% | 18.2% | 10.8% |
| Widowed | 16.2% | 9.0% | 5.6% |
| space5 | | | |
| Household Size | 2.05 | 2.66 | 2.60 |
| Households | 230 | 299 | 124,010,992 |
| Family Households | 133 | 203 | 80,755,759 |
| Married couple, w/children | 17.3% | 33.0% | 30.5% |
| Married couple, no children | 60.9% | 28.1% | 42.9% |
| Non Family Households | 97 | 96 | 43,255,233 |
| Single householder, w/children | 16.5% | 25.1% | 15.8% |
| Single householder, no children | 5.3% | 13.8% | 10.8% |