| | Little Sioux, IA | Blencoe, IA | United States |
| Population | 177 | 257 | 329,725,481 |
| Female Population | 60.5% | 53.3% | 50.5% |
| Male Population | 39.6% | 46.7% | 49.5% |
| Median Age | 43.1 | 52.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 170 | 224 | 309,327,143 |
| Population - 2000 | 217 | 231 | 285,036,114 |
| Population - 1990 | 205 | 250 | 251,960,433 |
| Pop. 2000 to Now | -26.7% | -15.2% | 15.6% |
| Pop. 1990 to Now | -22.4% | -21.6% | 30.8% |
| space4 | | | |
| Population Density | 477.1 | 339.5 | 93.4 |
| Land Area | 0.4 | 0.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Little Sioux, IA | Blencoe, IA | United States |
| Age 0 to 4 | 8.5% | 10.9% | 5.9% |
| Age 5 to 9 | 2.3% | 6.2% | 6.1% |
| Age 10 to 14 | 17.5% | 3.5% | 6.6% |
| Age 15 to 17 | 4.0% | 2.7% | 3.9% |
| Age 18 to 20 | 4.0% | 0.8% | 4.0% |
| Age 21 to 24 | 1.1% | 2.3% | 5.2% |
| Age 25 to 34 | 3.4% | 14.4% | 13.8% |
| Age 35 to 44 | 13.6% | 7.0% | 12.9% |
| Age 45 to 54 | 7.3% | 4.7% | 12.6% |
| Age 55 to 59 | 10.2% | 7.0% | 6.7% |
| Age 60 to 64 | 4.0% | 5.1% | 6.3% |
| Age 65 to 74 | 13.6% | 19.1% | 9.6% |
| Age 75 to 84 | 9.6% | 12.1% | 4.5% |
| Age 85 and over | 1.1% | 4.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Little Sioux, IA | Blencoe, IA | United States |
| White | 73.4% | 97.7% | 59.4% |
| Black | 7.9% | 0.8% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.7% | 0.0% | 3.2% |
| Hispanic | 16.9% | 1.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Little Sioux, IA | Blencoe, IA | United States |
| Married Population | 42.5% | 69.6% | 49.8% |
| Currently Married | 42.5% | 69.6% | 48.0% |
| Married but Separated | 0.0% | 0.0% | 1.8% |
| Single Population | 57.5% | 30.4% | 50.2% |
| Never Married | 24.4% | 17.6% | 33.8% |
| Divorced | 11.8% | 7.8% | 10.8% |
| Widowed | 21.3% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 2.33 | 2.40 | 2.60 |
| Households | 76 | 107 | 124,010,992 |
| Family Households | 33 | 83 | 80,755,759 |
| Married couple, w/children | 18.2% | 20.5% | 30.5% |
| Married couple, no children | 54.5% | 65.1% | 42.9% |
| Non Family Households | 43 | 24 | 43,255,233 |
| Single householder, w/children | 27.3% | 14.5% | 15.8% |
| Single householder, no children | 0.0% | 0.0% | 10.8% |