| | Ipswich, SD | Wessington Springs, SD | United States |
| Population | 1,183 | 639 | 329,725,481 |
| Female Population | 50.2% | 55.6% | 50.5% |
| Male Population | 49.8% | 44.4% | 49.5% |
| Median Age | 35.8 | 62 | 38.4 |
| space3 | | | |
| Population - 2010 | 955 | 965 | 309,327,143 |
| Population - 2000 | 943 | 1,011 | 285,036,114 |
| Population - 1990 | 965 | 1,083 | 251,960,433 |
| Pop. 2000 to Now | -5.9% | -11.1% | 15.6% |
| Pop. 1990 to Now | -8.1% | -17.0% | 30.8% |
| space4 | | | |
| Population Density | 882.8 | 354.8 | 93.4 |
| Land Area | 1.3 | 1.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ipswich, SD | Wessington Springs, SD | United States |
| Age 0 to 4 | 5.9% | 2.5% | 5.9% |
| Age 5 to 9 | 10.4% | 1.1% | 6.1% |
| Age 10 to 14 | 6.7% | 5.2% | 6.6% |
| Age 15 to 17 | 4.3% | 3.4% | 3.9% |
| Age 18 to 20 | 2.6% | 0.2% | 4.0% |
| Age 21 to 24 | 2.9% | 1.4% | 5.2% |
| Age 25 to 34 | 15.0% | 11.7% | 13.8% |
| Age 35 to 44 | 14.8% | 3.9% | 12.9% |
| Age 45 to 54 | 9.0% | 7.2% | 12.6% |
| Age 55 to 59 | 3.8% | 9.2% | 6.7% |
| Age 60 to 64 | 5.9% | 8.1% | 6.3% |
| Age 65 to 74 | 10.5% | 18.5% | 9.6% |
| Age 75 to 84 | 3.8% | 16.7% | 4.5% |
| Age 85 and over | 4.4% | 10.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ipswich, SD | Wessington Springs, SD | United States |
| White | 91.9% | 93.0% | 59.4% |
| Black | 0.1% | 0.0% | 12.2% |
| Asian | 0.3% | 0.0% | 5.6% |
| Native American | 2.0% | 1.7% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.6% | 4.7% | 3.2% |
| Hispanic | 5.2% | 0.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ipswich, SD | Wessington Springs, SD | United States |
| Married Population | 55.4% | 53.2% | 49.8% |
| Currently Married | 53.9% | 52.1% | 48.0% |
| Married but Separated | 1.5% | 1.0% | 1.8% |
| Single Population | 44.6% | 46.8% | 50.2% |
| Never Married | 25.2% | 21.3% | 33.8% |
| Divorced | 8.6% | 8.4% | 10.8% |
| Widowed | 10.8% | 17.2% | 5.6% |
| space5 | | | |
| Household Size | 2.84 | 1.66 | 2.60 |
| Households | 397 | 362 | 124,010,992 |
| Family Households | 263 | 138 | 80,755,759 |
| Married couple, w/children | 48.3% | 26.1% | 30.5% |
| Married couple, no children | 38.4% | 68.1% | 42.9% |
| Non Family Households | 134 | 224 | 43,255,233 |
| Single householder, w/children | 8.0% | 5.8% | 15.8% |
| Single householder, no children | 5.3% | 0.0% | 10.8% |