| | Midland, SD | Fort Pierre, SD | United States |
| Population | 152 | 2,426 | 329,725,481 |
| Female Population | 58.6% | 38.5% | 50.5% |
| Male Population | 41.5% | 61.5% | 49.5% |
| Median Age | 54.8 | 41.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 128 | 2,099 | 309,327,143 |
| Population - 2000 | 179 | 1,991 | 285,036,114 |
| Population - 1990 | 233 | 1,854 | 251,960,433 |
| Pop. 2000 to Now | -30.7% | 12.3% | 15.6% |
| Pop. 1990 to Now | -46.8% | 20.6% | 30.8% |
| space4 | | | |
| Population Density | 441.9 | 777.8 | 93.4 |
| Land Area | 0.3 | 3.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Midland, SD | Fort Pierre, SD | United States |
| Age 0 to 4 | 3.9% | 5.2% | 5.9% |
| Age 5 to 9 | 2.6% | 8.7% | 6.1% |
| Age 10 to 14 | 0.0% | 4.6% | 6.6% |
| Age 15 to 17 | 0.0% | 5.1% | 3.9% |
| Age 18 to 20 | 0.0% | 1.8% | 4.0% |
| Age 21 to 24 | 0.0% | 3.7% | 5.2% |
| Age 25 to 34 | 25.7% | 7.6% | 13.8% |
| Age 35 to 44 | 2.0% | 17.8% | 12.9% |
| Age 45 to 54 | 17.1% | 9.4% | 12.6% |
| Age 55 to 59 | 9.9% | 8.7% | 6.7% |
| Age 60 to 64 | 11.2% | 7.4% | 6.3% |
| Age 65 to 74 | 21.1% | 12.6% | 9.6% |
| Age 75 to 84 | 2.6% | 5.0% | 4.5% |
| Age 85 and over | 3.9% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Midland, SD | Fort Pierre, SD | United States |
| White | 98.0% | 87.7% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 4.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 2.0% | 3.1% | 3.2% |
| Hispanic | 0.0% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Midland, SD | Fort Pierre, SD | United States |
| Married Population | 72.5% | 54.8% | 49.8% |
| Currently Married | 72.5% | 54.2% | 48.0% |
| Married but Separated | 0.0% | 0.5% | 1.8% |
| Single Population | 27.5% | 45.2% | 50.2% |
| Never Married | 19.7% | 29.5% | 33.8% |
| Divorced | 2.8% | 9.3% | 10.8% |
| Widowed | 4.9% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.14 | 2.31 | 2.60 |
| Households | 71 | 1,049 | 124,010,992 |
| Family Households | 57 | 630 | 80,755,759 |
| Married couple, w/children | 7.0% | 33.7% | 30.5% |
| Married couple, no children | 93.0% | 48.9% | 42.9% |
| Non Family Households | 14 | 419 | 43,255,233 |
| Single householder, w/children | 0.0% | 6.5% | 15.8% |
| Single householder, no children | 0.0% | 11.0% | 10.8% |