| | Bucklin township, MO | Brookfield, MO | United States |
| Population | 562 | 4,161 | 329,725,481 |
| Female Population | 58.4% | 50.2% | 50.5% |
| Male Population | 41.6% | 49.8% | 49.5% |
| Median Age | 50 | 43 | 38.4 |
| space3 | | | |
| Population - 2010 | 736 | 4,537 | 309,327,143 |
| Population - 2000 | 807 | 4,769 | 285,036,114 |
| Population - 1990 | 899 | 4,888 | 251,960,433 |
| Pop. 2000 to Now | -15.9% | -12.4% | 15.6% |
| Pop. 1990 to Now | -24.5% | -14.5% | 30.8% |
| space4 | | | |
| Population Density | 12.7 | 973.6 | 93.4 |
| Land Area | 44.4 | 4.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bucklin township, MO | Brookfield, MO | United States |
| Age 0 to 4 | 5.5% | 5.6% | 5.9% |
| Age 5 to 9 | 7.5% | 5.9% | 6.1% |
| Age 10 to 14 | 8.5% | 6.9% | 6.6% |
| Age 15 to 17 | 2.8% | 4.9% | 3.9% |
| Age 18 to 20 | 0.4% | 1.7% | 4.0% |
| Age 21 to 24 | 1.8% | 4.1% | 5.2% |
| Age 25 to 34 | 4.4% | 12.5% | 13.8% |
| Age 35 to 44 | 16.7% | 11.0% | 12.9% |
| Age 45 to 54 | 7.8% | 11.0% | 12.6% |
| Age 55 to 59 | 7.8% | 5.0% | 6.7% |
| Age 60 to 64 | 10.3% | 8.6% | 6.3% |
| Age 65 to 74 | 16.2% | 13.2% | 9.6% |
| Age 75 to 84 | 7.7% | 7.0% | 4.5% |
| Age 85 and over | 2.5% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bucklin township, MO | Brookfield, MO | United States |
| White | 94.5% | 93.5% | 59.4% |
| Black | 0.0% | 1.6% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.8% | 1.3% | 3.2% |
| Hispanic | 3.4% | 2.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Bucklin township, MO | Brookfield, MO | United States |
| Married Population | 65.8% | 49.9% | 49.8% |
| Currently Married | 65.3% | 47.9% | 48.0% |
| Married but Separated | 0.5% | 2.0% | 1.8% |
| Single Population | 34.2% | 50.1% | 50.2% |
| Never Married | 11.1% | 24.8% | 33.8% |
| Divorced | 15.9% | 18.1% | 10.8% |
| Widowed | 7.3% | 7.1% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.38 | 2.60 |
| Households | 246 | 1,684 | 124,010,992 |
| Family Households | 144 | 1,068 | 80,755,759 |
| Married couple, w/children | 32.6% | 26.4% | 30.5% |
| Married couple, no children | 59.0% | 47.1% | 42.9% |
| Non Family Households | 102 | 616 | 43,255,233 |
| Single householder, w/children | 8.3% | 19.1% | 15.8% |
| Single householder, no children | 0.0% | 7.4% | 10.8% |