| | Dongola, IL | Merrillan, WI | United States |
| Population | 634 | 624 | 329,725,481 |
| Female Population | 51.9% | 43.3% | 50.5% |
| Male Population | 48.1% | 56.7% | 49.5% |
| Median Age | 36.6 | 37.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 722 | 536 | 309,327,143 |
| Population - 2000 | 806 | 585 | 285,036,114 |
| Population - 1990 | 728 | 553 | 251,960,433 |
| Pop. 2000 to Now | -16.6% | -10.8% | 15.6% |
| Pop. 1990 to Now | -7.7% | -5.6% | 30.8% |
| space4 | | | |
| Population Density | 582.2 | 492.5 | 93.4 |
| Land Area | 1.1 | 1.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Dongola, IL | Merrillan, WI | United States |
| Age 0 to 4 | 8.2% | 5.0% | 5.9% |
| Age 5 to 9 | 7.4% | 6.3% | 6.1% |
| Age 10 to 14 | 6.0% | 12.7% | 6.6% |
| Age 15 to 17 | 7.7% | 3.8% | 3.9% |
| Age 18 to 20 | 4.3% | 3.7% | 4.0% |
| Age 21 to 24 | 6.8% | 2.7% | 5.2% |
| Age 25 to 34 | 7.7% | 6.7% | 13.8% |
| Age 35 to 44 | 7.6% | 14.7% | 12.9% |
| Age 45 to 54 | 8.4% | 9.3% | 12.6% |
| Age 55 to 59 | 11.2% | 6.4% | 6.7% |
| Age 60 to 64 | 8.5% | 6.9% | 6.3% |
| Age 65 to 74 | 9.1% | 14.4% | 9.6% |
| Age 75 to 84 | 7.1% | 5.8% | 4.5% |
| Age 85 and over | 0.0% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Dongola, IL | Merrillan, WI | United States |
| White | 87.5% | 81.3% | 59.4% |
| Black | 3.3% | 0.6% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 7.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 5.3% | 3.2% |
| Hispanic | 6.6% | 5.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Dongola, IL | Merrillan, WI | United States |
| Married Population | 33.4% | 44.8% | 49.8% |
| Currently Married | 30.2% | 42.1% | 48.0% |
| Married but Separated | 3.2% | 2.7% | 1.8% |
| Single Population | 66.6% | 55.2% | 50.2% |
| Never Married | 42.5% | 30.3% | 33.8% |
| Divorced | 13.1% | 17.5% | 10.8% |
| Widowed | 11.1% | 7.4% | 5.6% |
| space5 | | | |
| Household Size | 2.73 | 2.42 | 2.60 |
| Households | 226 | 258 | 124,010,992 |
| Family Households | 125 | 146 | 80,755,759 |
| Married couple, w/children | 16.8% | 23.3% | 30.5% |
| Married couple, no children | 40.8% | 45.2% | 42.9% |
| Non Family Households | 101 | 112 | 43,255,233 |
| Single householder, w/children | 26.4% | 24.7% | 15.8% |
| Single householder, no children | 16.0% | 6.8% | 10.8% |