| | Wisconsin Dells, WI | Sparta, WI | United States |
| Population | 2,685 | 9,955 | 329,725,481 |
| Female Population | 53.1% | 50.1% | 50.5% |
| Male Population | 46.9% | 49.9% | 49.5% |
| Median Age | 47.6 | 39.4 | 38.4 |
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| Population - 2010 | 2,715 | 9,539 | 309,327,143 |
| Population - 2000 | 2,418 | 8,648 | 285,036,114 |
| Population - 1990 | 2,393 | 7,788 | 251,960,433 |
| Pop. 2000 to Now | 26.6% | 13.3% | 15.6% |
| Pop. 1990 to Now | 27.9% | 25.8% | 30.8% |
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| Population Density | 342.4 | 1,254.1 | 93.4 |
| Land Area | 7.8 | 7.9 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Wisconsin Dells, WI | Sparta, WI | United States |
| Age 0 to 4 | 5.1% | 5.3% | 5.9% |
| Age 5 to 9 | 4.6% | 6.6% | 6.1% |
| Age 10 to 14 | 4.9% | 7.3% | 6.6% |
| Age 15 to 17 | 4.2% | 5.3% | 3.9% |
| Age 18 to 20 | 1.9% | 2.4% | 4.0% |
| Age 21 to 24 | 2.2% | 3.6% | 5.2% |
| Age 25 to 34 | 12.5% | 14.3% | 13.8% |
| Age 35 to 44 | 12.6% | 12.6% | 12.9% |
| Age 45 to 54 | 9.2% | 12.9% | 12.6% |
| Age 55 to 59 | 10.4% | 8.0% | 6.7% |
| Age 60 to 64 | 13.1% | 6.5% | 6.3% |
| Age 65 to 74 | 11.8% | 10.0% | 9.6% |
| Age 75 to 84 | 4.1% | 3.8% | 4.5% |
| Age 85 and over | 3.4% | 1.5% | 1.9% |
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| Race | | | |
| | Wisconsin Dells, WI | Sparta, WI | United States |
| White | 88.3% | 87.5% | 59.4% |
| Black | 4.3% | 2.0% | 12.2% |
| Asian | 0.0% | 1.2% | 5.6% |
| Native American | 0.0% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 2.7% | 3.2% |
| Hispanic | 7.3% | 5.4% | 18.4% |
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| Marriage & Family | | | |
| | Wisconsin Dells, WI | Sparta, WI | United States |
| Married Population | 44.6% | 45.4% | 49.8% |
| Currently Married | 44.2% | 42.5% | 48.0% |
| Married but Separated | 0.4% | 2.9% | 1.8% |
| Single Population | 55.4% | 54.6% | 50.2% |
| Never Married | 27.6% | 33.2% | 33.8% |
| Divorced | 16.8% | 16.4% | 10.8% |
| Widowed | 10.9% | 5.0% | 5.6% |
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| Household Size | 1.99 | 2.38 | 2.60 |
| Households | 1,317 | 4,084 | 124,010,992 |
| Family Households | 623 | 2,460 | 80,755,759 |
| Married couple, w/children | 41.3% | 25.2% | 30.5% |
| Married couple, no children | 36.0% | 39.9% | 42.9% |
| Non Family Households | 694 | 1,624 | 43,255,233 |
| Single householder, w/children | 12.0% | 22.9% | 15.8% |
| Single householder, no children | 10.8% | 12.0% | 10.8% |