| | Cottage Grove, WI | Waunakee, WI | United States |
| Population | 7,255 | 14,679 | 329,725,481 |
| Female Population | 51.4% | 47.5% | 50.5% |
| Male Population | 48.6% | 52.5% | 49.5% |
| Median Age | 39.4 | 39 | 38.4 |
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| Population - 2010 | 6,385 | 12,152 | 309,327,143 |
| Population - 2000 | 4,059 | 8,995 | 285,036,114 |
| Population - 1990 | 1,131 | 5,897 | 251,960,433 |
| Pop. 2000 to Now | 76.4% | 57.7% | 15.6% |
| Pop. 1990 to Now | 532.9% | 140.6% | 30.8% |
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| Population Density | 1,822.0 | 2,171.5 | 93.4 |
| Land Area | 4.0 | 6.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Cottage Grove, WI | Waunakee, WI | United States |
| Age 0 to 4 | 7.7% | 6.6% | 5.9% |
| Age 5 to 9 | 7.1% | 7.3% | 6.1% |
| Age 10 to 14 | 10.2% | 8.5% | 6.6% |
| Age 15 to 17 | 2.6% | 6.5% | 3.9% |
| Age 18 to 20 | 1.6% | 3.4% | 4.0% |
| Age 21 to 24 | 4.5% | 2.2% | 5.2% |
| Age 25 to 34 | 8.3% | 8.8% | 13.8% |
| Age 35 to 44 | 19.0% | 17.8% | 12.9% |
| Age 45 to 54 | 15.8% | 16.2% | 12.6% |
| Age 55 to 59 | 5.3% | 5.8% | 6.7% |
| Age 60 to 64 | 4.1% | 4.2% | 6.3% |
| Age 65 to 74 | 7.2% | 7.3% | 9.6% |
| Age 75 to 84 | 5.3% | 3.4% | 4.5% |
| Age 85 and over | 1.2% | 1.8% | 1.9% |
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| Race | | | |
| | Cottage Grove, WI | Waunakee, WI | United States |
| White | 85.7% | 90.6% | 59.4% |
| Black | 0.1% | 1.6% | 12.2% |
| Asian | 6.0% | 1.1% | 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 | 1.8% | 1.9% | 3.2% |
| Hispanic | 6.4% | 4.8% | 18.4% |
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| Marriage & Family | | | |
| | Cottage Grove, WI | Waunakee, WI | United States |
| Married Population | 70.3% | 61.0% | 49.8% |
| Currently Married | 69.2% | 60.3% | 48.0% |
| Married but Separated | 1.1% | 0.8% | 1.8% |
| Single Population | 29.7% | 39.0% | 50.2% |
| Never Married | 16.2% | 29.0% | 33.8% |
| Divorced | 8.8% | 8.2% | 10.8% |
| Widowed | 4.7% | 1.8% | 5.6% |
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| Household Size | 2.51 | 2.75 | 2.60 |
| Households | 2,884 | 5,318 | 124,010,992 |
| Family Households | 2,284 | 4,042 | 80,755,759 |
| Married couple, w/children | 40.1% | 41.5% | 30.5% |
| Married couple, no children | 44.4% | 40.3% | 42.9% |
| Non Family Households | 600 | 1,276 | 43,255,233 |
| Single householder, w/children | 13.2% | 12.9% | 15.8% |
| Single householder, no children | 2.4% | 5.3% | 10.8% |