| | Irene, SD | Menno, SD | United States |
| Population | 523 | 856 | 329,725,481 |
| Female Population | 57.9% | 52.9% | 50.5% |
| Male Population | 42.1% | 47.1% | 49.5% |
| Median Age | 35.3 | 45.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 419 | 603 | 309,327,143 |
| Population - 2000 | 432 | 729 | 285,036,114 |
| Population - 1990 | 464 | 768 | 251,960,433 |
| Pop. 2000 to Now | -6.7% | -15.6% | 15.6% |
| Pop. 1990 to Now | -13.2% | -19.9% | 30.8% |
| space4 | | | |
| Population Density | 2,051.0 | 1,649.3 | 93.4 |
| Land Area | 0.3 | 0.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Irene, SD | Menno, SD | United States |
| Age 0 to 4 | 6.7% | 10.6% | 5.9% |
| Age 5 to 9 | 7.6% | 3.3% | 6.1% |
| Age 10 to 14 | 8.6% | 6.9% | 6.6% |
| Age 15 to 17 | 4.2% | 4.8% | 3.9% |
| Age 18 to 20 | 0.6% | 2.2% | 4.0% |
| Age 21 to 24 | 9.9% | 4.7% | 5.2% |
| Age 25 to 34 | 11.9% | 7.4% | 13.8% |
| Age 35 to 44 | 15.5% | 9.9% | 12.9% |
| Age 45 to 54 | 5.7% | 9.3% | 12.6% |
| Age 55 to 59 | 4.4% | 5.7% | 6.7% |
| Age 60 to 64 | 5.5% | 8.1% | 6.3% |
| Age 65 to 74 | 9.2% | 11.3% | 9.6% |
| Age 75 to 84 | 6.3% | 6.9% | 4.5% |
| Age 85 and over | 3.8% | 8.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Irene, SD | Menno, SD | United States |
| White | 95.6% | 99.1% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 1.1% | 0.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 0.4% | 3.2% |
| Hispanic | 1.0% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Irene, SD | Menno, SD | United States |
| Married Population | 36.2% | 55.2% | 49.8% |
| Currently Married | 35.5% | 55.2% | 48.0% |
| Married but Separated | 0.7% | 0.0% | 1.8% |
| Single Population | 63.8% | 44.8% | 50.2% |
| Never Married | 33.5% | 22.9% | 33.8% |
| Divorced | 24.1% | 15.2% | 10.8% |
| Widowed | 6.2% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 2.38 | 2.60 |
| Households | 207 | 346 | 124,010,992 |
| Family Households | 109 | 193 | 80,755,759 |
| Married couple, w/children | 22.0% | 35.2% | 30.5% |
| Married couple, no children | 33.0% | 56.5% | 42.9% |
| Non Family Households | 98 | 153 | 43,255,233 |
| Single householder, w/children | 37.6% | 6.7% | 15.8% |
| Single householder, no children | 7.3% | 1.6% | 10.8% |