| | Black Earth, WI | Monona, WI | United States |
| Population | 1,720 | 8,560 | 329,725,481 |
| Female Population | 45.4% | 48.6% | 50.5% |
| Male Population | 54.6% | 51.4% | 49.5% |
| Median Age | 40.9 | 45.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,340 | 7,575 | 309,327,143 |
| Population - 2000 | 1,320 | 8,018 | 285,036,114 |
| Population - 1990 | 1,248 | 8,637 | 251,960,433 |
| Pop. 2000 to Now | 7.7% | 1.8% | 15.6% |
| Pop. 1990 to Now | 13.9% | -5.5% | 30.8% |
| space4 | | | |
| Population Density | 2,037.9 | 2,626.6 | 93.4 |
| Land Area | 0.8 | 3.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Black Earth, WI | Monona, WI | United States |
| Age 0 to 4 | 8.0% | 4.2% | 5.9% |
| Age 5 to 9 | 8.0% | 5.4% | 6.1% |
| Age 10 to 14 | 6.3% | 5.4% | 6.6% |
| Age 15 to 17 | 1.5% | 4.0% | 3.9% |
| Age 18 to 20 | 0.9% | 1.4% | 4.0% |
| Age 21 to 24 | 2.6% | 5.0% | 5.2% |
| Age 25 to 34 | 11.0% | 11.9% | 13.8% |
| Age 35 to 44 | 15.1% | 12.0% | 12.9% |
| Age 45 to 54 | 10.2% | 12.6% | 12.6% |
| Age 55 to 59 | 4.4% | 9.1% | 6.7% |
| Age 60 to 64 | 4.4% | 7.1% | 6.3% |
| Age 65 to 74 | 23.1% | 13.6% | 9.6% |
| Age 75 to 84 | 2.9% | 6.6% | 4.5% |
| Age 85 and over | 1.7% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Black Earth, WI | Monona, WI | United States |
| White | 94.5% | 89.8% | 59.4% |
| Black | 0.0% | 2.7% | 12.2% |
| Asian | 0.7% | 2.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.2% | 2.4% | 3.2% |
| Hispanic | 2.6% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Black Earth, WI | Monona, WI | United States |
| Married Population | 66.0% | 54.0% | 49.8% |
| Currently Married | 65.7% | 53.4% | 48.0% |
| Married but Separated | 0.3% | 0.6% | 1.8% |
| Single Population | 34.0% | 46.0% | 50.2% |
| Never Married | 15.9% | 28.8% | 33.8% |
| Divorced | 13.1% | 12.2% | 10.8% |
| Widowed | 5.0% | 5.1% | 5.6% |
| space5 | | | |
| Household Size | 2.63 | 2.09 | 2.60 |
| Households | 642 | 4,073 | 124,010,992 |
| Family Households | 396 | 2,368 | 80,755,759 |
| Married couple, w/children | 37.4% | 27.8% | 30.5% |
| Married couple, no children | 50.3% | 52.0% | 42.9% |
| Non Family Households | 246 | 1,705 | 43,255,233 |
| Single householder, w/children | 8.3% | 14.3% | 15.8% |
| Single householder, no children | 4.0% | 5.9% | 10.8% |