| | Fort Atkinson, WI | Davenport, IA | United States |
| Population | 12,529 | 101,725 | 329,725,481 |
| Female Population | 49.7% | 50.4% | 50.5% |
| Male Population | 50.3% | 49.6% | 49.5% |
| Median Age | 41.6 | 37.8 | 38.4 |
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| Population - 2010 | 12,393 | 99,683 | 309,327,143 |
| Population - 2000 | 11,621 | 98,359 | 285,036,114 |
| Population - 1990 | 10,227 | 95,333 | 251,960,433 |
| Pop. 2000 to Now | 6.5% | 3.5% | 15.6% |
| Pop. 1990 to Now | 21.0% | 6.8% | 30.8% |
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| Population Density | 2,214.0 | 1,601.0 | 93.4 |
| Land Area | 5.7 | 63.5 | 3,531,905.4 |
| Water Area | 0.1 | 2.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Fort Atkinson, WI | Davenport, IA | United States |
| Age 0 to 4 | 4.4% | 6.2% | 5.9% |
| Age 5 to 9 | 4.5% | 5.7% | 6.1% |
| Age 10 to 14 | 7.5% | 6.0% | 6.6% |
| Age 15 to 17 | 4.8% | 3.8% | 3.9% |
| Age 18 to 20 | 2.9% | 4.3% | 4.0% |
| Age 21 to 24 | 4.4% | 5.7% | 5.2% |
| Age 25 to 34 | 13.7% | 14.5% | 13.8% |
| Age 35 to 44 | 12.1% | 12.8% | 12.9% |
| Age 45 to 54 | 11.9% | 11.9% | 12.6% |
| Age 55 to 59 | 7.9% | 7.0% | 6.7% |
| Age 60 to 64 | 8.2% | 6.5% | 6.3% |
| Age 65 to 74 | 10.7% | 9.4% | 9.6% |
| Age 75 to 84 | 4.7% | 4.1% | 4.5% |
| Age 85 and over | 2.6% | 2.2% | 1.9% |
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| Race | | | |
| | Fort Atkinson, WI | Davenport, IA | United States |
| White | 87.2% | 72.9% | 59.4% |
| Black | 1.0% | 10.7% | 12.2% |
| Asian | 0.3% | 2.2% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.1% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 3.2% | 4.7% | 3.2% |
| Hispanic | 8.1% | 8.9% | 18.4% |
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| Marriage & Family | | | |
| | Fort Atkinson, WI | Davenport, IA | United States |
| Married Population | 51.8% | 44.8% | 49.8% |
| Currently Married | 51.3% | 43.5% | 48.0% |
| Married but Separated | 0.5% | 1.3% | 1.8% |
| Single Population | 48.2% | 55.2% | 50.2% |
| Never Married | 29.2% | 36.9% | 33.8% |
| Divorced | 13.0% | 12.7% | 10.8% |
| Widowed | 6.1% | 5.6% | 5.6% |
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| Household Size | 2.32 | 2.36 | 2.60 |
| Households | 5,305 | 41,882 | 124,010,992 |
| Family Households | 3,300 | 23,778 | 80,755,759 |
| Married couple, w/children | 27.8% | 25.3% | 30.5% |
| Married couple, no children | 51.2% | 45.5% | 42.9% |
| Non Family Households | 2,005 | 18,104 | 43,255,233 |
| Single householder, w/children | 13.8% | 19.2% | 15.8% |
| Single householder, no children | 7.2% | 10.0% | 10.8% |