| | Waupun, WI | South Lyon, MI | United States |
| Population | 11,494 | 11,786 | 329,725,481 |
| Female Population | 41.9% | 53.4% | 50.5% |
| Male Population | 58.2% | 46.6% | 49.5% |
| Median Age | 38.5 | 43.8 | 38.4 |
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| Population - 2010 | 11,339 | 11,327 | 309,327,143 |
| Population - 2000 | 10,718 | 10,036 | 285,036,114 |
| Population - 1990 | 8,207 | 5,857 | 251,960,433 |
| Pop. 2000 to Now | 5.2% | 18.0% | 15.6% |
| Pop. 1990 to Now | 37.3% | 102.3% | 30.8% |
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| Population Density | 2,476.6 | 3,150.5 | 93.4 |
| Land Area | 4.6 | 3.7 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Waupun, WI | South Lyon, MI | United States |
| Age 0 to 4 | 4.6% | 4.5% | 5.9% |
| Age 5 to 9 | 5.6% | 6.4% | 6.1% |
| Age 10 to 14 | 7.2% | 6.3% | 6.6% |
| Age 15 to 17 | 3.3% | 3.3% | 3.9% |
| Age 18 to 20 | 2.0% | 4.0% | 4.0% |
| Age 21 to 24 | 5.6% | 6.2% | 5.2% |
| Age 25 to 34 | 14.6% | 9.2% | 13.8% |
| Age 35 to 44 | 17.9% | 11.4% | 12.9% |
| Age 45 to 54 | 10.7% | 13.8% | 12.6% |
| Age 55 to 59 | 6.0% | 9.1% | 6.7% |
| Age 60 to 64 | 7.2% | 9.0% | 6.3% |
| Age 65 to 74 | 7.6% | 9.4% | 9.6% |
| Age 75 to 84 | 4.7% | 5.8% | 4.5% |
| Age 85 and over | 3.1% | 1.6% | 1.9% |
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| Race | | | |
| | Waupun, WI | South Lyon, MI | United States |
| White | 87.0% | 89.9% | 59.4% |
| Black | 4.0% | 0.6% | 12.2% |
| Asian | 1.5% | 2.8% | 5.6% |
| Native American | 0.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.2% | 4.1% | 3.2% |
| Hispanic | 5.7% | 2.7% | 18.4% |
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| Marriage & Family | | | |
| | Waupun, WI | South Lyon, MI | United States |
| Married Population | 45.3% | 53.9% | 49.8% |
| Currently Married | 44.3% | 53.3% | 48.0% |
| Married but Separated | 1.0% | 0.6% | 1.8% |
| Single Population | 54.7% | 46.1% | 50.2% |
| Never Married | 34.5% | 25.9% | 33.8% |
| Divorced | 13.4% | 14.1% | 10.8% |
| Widowed | 6.8% | 6.1% | 5.6% |
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| Household Size | 2.48 | 2.31 | 2.60 |
| Households | 4,165 | 5,074 | 124,010,992 |
| Family Households | 2,510 | 3,170 | 80,755,759 |
| Married couple, w/children | 31.6% | 29.4% | 30.5% |
| Married couple, no children | 42.2% | 49.8% | 42.9% |
| Non Family Households | 1,655 | 1,904 | 43,255,233 |
| Single householder, w/children | 21.7% | 13.4% | 15.8% |
| Single householder, no children | 4.5% | 7.4% | 10.8% |