| | Butler, MO | Kiron, IA | United States |
| Population | 4,313 | 273 | 329,725,481 |
| Female Population | 50.4% | 50.9% | 50.5% |
| Male Population | 49.6% | 49.1% | 49.5% |
| Median Age | 38 | 26.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,210 | 278 | 309,327,143 |
| Population - 2000 | 4,209 | 273 | 285,036,114 |
| Population - 1990 | 4,099 | 301 | 251,960,433 |
| Pop. 2000 to Now | -4.9% | -4.0% | 15.6% |
| Pop. 1990 to Now | -2.4% | -13.0% | 30.8% |
| space4 | | | |
| Population Density | 1,060.5 | 1,312.5 | 93.4 |
| Land Area | 4.1 | 0.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Butler, MO | Kiron, IA | United States |
| Age 0 to 4 | 5.6% | 2.9% | 5.9% |
| Age 5 to 9 | 9.4% | 24.2% | 6.1% |
| Age 10 to 14 | 7.7% | 12.1% | 6.6% |
| Age 15 to 17 | 4.8% | 3.3% | 3.9% |
| Age 18 to 20 | 0.8% | 4.4% | 4.0% |
| Age 21 to 24 | 3.5% | 2.2% | 5.2% |
| Age 25 to 34 | 13.1% | 2.2% | 13.8% |
| Age 35 to 44 | 10.9% | 8.4% | 12.9% |
| Age 45 to 54 | 10.2% | 7.3% | 12.6% |
| Age 55 to 59 | 6.0% | 7.0% | 6.7% |
| Age 60 to 64 | 8.6% | 6.2% | 6.3% |
| Age 65 to 74 | 10.3% | 10.3% | 9.6% |
| Age 75 to 84 | 5.6% | 8.8% | 4.5% |
| Age 85 and over | 3.6% | 0.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Butler, MO | Kiron, IA | United States |
| White | 89.8% | 85.0% | 59.4% |
| Black | 4.2% | 0.7% | 12.2% |
| Asian | 1.1% | 0.0% | 5.6% |
| Native American | 0.5% | 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 | 2.7% | 14.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Butler, MO | Kiron, IA | United States |
| Married Population | 39.6% | 48.8% | 49.8% |
| Currently Married | 38.7% | 44.6% | 48.0% |
| Married but Separated | 1.0% | 4.2% | 1.8% |
| Single Population | 60.4% | 51.2% | 50.2% |
| Never Married | 28.7% | 33.7% | 33.8% |
| Divorced | 20.2% | 10.2% | 10.8% |
| Widowed | 11.6% | 7.2% | 5.6% |
| space5 | | | |
| Household Size | 2.49 | 2.76 | 2.60 |
| Households | 1,630 | 99 | 124,010,992 |
| Family Households | 900 | 59 | 80,755,759 |
| Married couple, w/children | 18.2% | 11.9% | 30.5% |
| Married couple, no children | 38.0% | 47.5% | 42.9% |
| Non Family Households | 730 | 40 | 43,255,233 |
| Single householder, w/children | 39.4% | 39.0% | 15.8% |
| Single householder, no children | 4.3% | 1.7% | 10.8% |