| | Elk Point, SD | Seward, NE | United States |
| Population | 2,248 | 7,651 | 329,725,481 |
| Female Population | 49.1% | 49.6% | 50.5% |
| Male Population | 50.9% | 50.4% | 49.5% |
| Median Age | 34.2 | 30.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,973 | 6,988 | 309,327,143 |
| Population - 2000 | 1,714 | 6,319 | 285,036,114 |
| Population - 1990 | 1,423 | 5,634 | 251,960,433 |
| Pop. 2000 to Now | 9.3% | 16.5% | 15.6% |
| Pop. 1990 to Now | 31.7% | 30.7% | 30.8% |
| space4 | | | |
| Population Density | 1,649.3 | 1,784.7 | 93.4 |
| Land Area | 1.4 | 4.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Elk Point, SD | Seward, NE | United States |
| Age 0 to 4 | 11.9% | 6.2% | 5.9% |
| Age 5 to 9 | 7.4% | 6.9% | 6.1% |
| Age 10 to 14 | 8.1% | 5.9% | 6.6% |
| Age 15 to 17 | 4.4% | 4.5% | 3.9% |
| Age 18 to 20 | 2.8% | 12.3% | 4.0% |
| Age 21 to 24 | 1.5% | 8.3% | 5.2% |
| Age 25 to 34 | 14.9% | 10.7% | 13.8% |
| Age 35 to 44 | 14.9% | 11.1% | 12.9% |
| Age 45 to 54 | 8.0% | 9.4% | 12.6% |
| Age 55 to 59 | 3.4% | 3.9% | 6.7% |
| Age 60 to 64 | 3.7% | 5.2% | 6.3% |
| Age 65 to 74 | 8.1% | 7.9% | 9.6% |
| Age 75 to 84 | 4.1% | 4.3% | 4.5% |
| Age 85 and over | 6.9% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Elk Point, SD | Seward, NE | United States |
| White | 97.8% | 93.9% | 59.4% |
| Black | 0.0% | 0.6% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.5% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.4% | 1.4% | 3.2% |
| Hispanic | 1.2% | 3.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Elk Point, SD | Seward, NE | United States |
| Married Population | 60.2% | 47.0% | 49.8% |
| Currently Married | 58.6% | 46.3% | 48.0% |
| Married but Separated | 1.6% | 0.8% | 1.8% |
| Single Population | 39.8% | 53.0% | 50.2% |
| Never Married | 21.2% | 39.3% | 33.8% |
| Divorced | 11.1% | 7.6% | 10.8% |
| Widowed | 7.5% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.52 | 2.60 |
| Households | 845 | 2,614 | 124,010,992 |
| Family Households | 549 | 1,737 | 80,755,759 |
| Married couple, w/children | 45.5% | 35.9% | 30.5% |
| Married couple, no children | 40.4% | 44.3% | 42.9% |
| Non Family Households | 296 | 877 | 43,255,233 |
| Single householder, w/children | 12.2% | 13.7% | 15.8% |
| Single householder, no children | 1.8% | 6.1% | 10.8% |