| | Shannon, IL | Muscoda, WI | United States |
| Population | 786 | 1,194 | 329,725,481 |
| Female Population | 54.1% | 46.8% | 50.5% |
| Male Population | 45.9% | 53.2% | 49.5% |
| Median Age | 48 | 39.4 | 38.4 |
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| Population - 2010 | 755 | 1,325 | 309,327,143 |
| Population - 2000 | 854 | 1,453 | 285,036,114 |
| Population - 1990 | 887 | 1,287 | 251,960,433 |
| Pop. 2000 to Now | -19.9% | -14.9% | 15.6% |
| Pop. 1990 to Now | -22.9% | -4.0% | 30.8% |
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| Population Density | 1,640.9 | 783.0 | 93.4 |
| Land Area | 0.5 | 1.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Shannon, IL | Muscoda, WI | United States |
| Age 0 to 4 | 5.6% | 7.5% | 5.9% |
| Age 5 to 9 | 6.4% | 3.1% | 6.1% |
| Age 10 to 14 | 5.3% | 5.3% | 6.6% |
| Age 15 to 17 | 3.1% | 3.4% | 3.9% |
| Age 18 to 20 | 4.3% | 6.4% | 4.0% |
| Age 21 to 24 | 2.5% | 3.3% | 5.2% |
| Age 25 to 34 | 9.5% | 15.4% | 13.8% |
| Age 35 to 44 | 10.2% | 9.6% | 12.9% |
| Age 45 to 54 | 9.9% | 13.0% | 12.6% |
| Age 55 to 59 | 12.1% | 5.6% | 6.7% |
| Age 60 to 64 | 3.7% | 7.4% | 6.3% |
| Age 65 to 74 | 11.1% | 10.6% | 9.6% |
| Age 75 to 84 | 10.3% | 6.5% | 4.5% |
| Age 85 and over | 6.0% | 2.9% | 1.9% |
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| Race | | | |
| | Shannon, IL | Muscoda, WI | United States |
| White | 92.2% | 98.5% | 59.4% |
| Black | 0.0% | 0.5% | 12.2% |
| Asian | 1.0% | 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 | 2.4% | 0.8% | 3.2% |
| Hispanic | 4.3% | 0.3% | 18.4% |
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| Marriage & Family | | | |
| | Shannon, IL | Muscoda, WI | United States |
| Married Population | 63.5% | 39.3% | 49.8% |
| Currently Married | 61.1% | 37.6% | 48.0% |
| Married but Separated | 2.5% | 1.7% | 1.8% |
| Single Population | 36.5% | 60.7% | 50.2% |
| Never Married | 20.9% | 35.0% | 33.8% |
| Divorced | 6.2% | 15.0% | 10.8% |
| Widowed | 9.4% | 10.6% | 5.6% |
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| Household Size | 2.32 | 2.08 | 2.60 |
| Households | 339 | 552 | 124,010,992 |
| Family Households | 219 | 260 | 80,755,759 |
| Married couple, w/children | 27.4% | 40.0% | 30.5% |
| Married couple, no children | 59.4% | 33.8% | 42.9% |
| Non Family Households | 120 | 292 | 43,255,233 |
| Single householder, w/children | 9.6% | 17.3% | 15.8% |
| Single householder, no children | 3.7% | 8.8% | 10.8% |