| | Springfield, SD | Yankton, SD | United States |
| Population | 2,108 | 15,332 | 329,725,481 |
| Female Population | 17.6% | 48.7% | 50.5% |
| Male Population | 82.4% | 51.3% | 49.5% |
| Median Age | 37 | 40.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,986 | 14,470 | 309,327,143 |
| Population - 2000 | 792 | 13,528 | 285,036,114 |
| Population - 1990 | 834 | 12,703 | 251,960,433 |
| Pop. 2000 to Now | 141.9% | 8.3% | 15.6% |
| Pop. 1990 to Now | 129.7% | 15.3% | 30.8% |
| space4 | | | |
| Population Density | 2,044.6 | 1,789.5 | 93.4 |
| Land Area | 1.0 | 8.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Springfield, SD | Yankton, SD | United States |
| Age 0 to 4 | 3.6% | 5.9% | 5.9% |
| Age 5 to 9 | 3.0% | 5.2% | 6.1% |
| Age 10 to 14 | 0.7% | 6.5% | 6.6% |
| Age 15 to 17 | 1.2% | 3.7% | 3.9% |
| Age 18 to 20 | 1.2% | 3.5% | 4.0% |
| Age 21 to 24 | 10.2% | 6.5% | 5.2% |
| Age 25 to 34 | 26.8% | 11.0% | 13.8% |
| Age 35 to 44 | 18.2% | 12.9% | 12.9% |
| Age 45 to 54 | 15.0% | 11.3% | 12.6% |
| Age 55 to 59 | 5.4% | 5.7% | 6.7% |
| Age 60 to 64 | 4.5% | 7.4% | 6.3% |
| Age 65 to 74 | 5.7% | 10.4% | 9.6% |
| Age 75 to 84 | 2.9% | 7.0% | 4.5% |
| Age 85 and over | 1.5% | 3.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Springfield, SD | Yankton, SD | United States |
| White | 65.3% | 85.2% | 59.4% |
| Black | 3.6% | 1.8% | 12.2% |
| Asian | 0.5% | 0.2% | 5.6% |
| Native American | 18.0% | 3.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.6% | 2.8% | 3.2% |
| Hispanic | 7.0% | 6.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Springfield, SD | Yankton, SD | United States |
| Married Population | 25.6% | 47.8% | 49.8% |
| Currently Married | 20.3% | 46.7% | 48.0% |
| Married but Separated | 5.3% | 1.1% | 1.8% |
| Single Population | 74.4% | 52.2% | 50.2% |
| Never Married | 52.5% | 35.2% | 33.8% |
| Divorced | 18.0% | 10.6% | 10.8% |
| Widowed | 3.9% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.08 | 2.15 | 2.60 |
| Households | 352 | 6,577 | 124,010,992 |
| Family Households | 183 | 3,618 | 80,755,759 |
| Married couple, w/children | 15.3% | 29.7% | 30.5% |
| Married couple, no children | 62.3% | 47.9% | 42.9% |
| Non Family Households | 169 | 2,959 | 43,255,233 |
| Single householder, w/children | 14.2% | 16.9% | 15.8% |
| Single householder, no children | 8.2% | 5.6% | 10.8% |