| | Kiel, WI | Adams, WI | United States |
| Population | 3,867 | 2,167 | 329,725,481 |
| Female Population | 50.6% | 53.7% | 50.5% |
| Male Population | 49.4% | 46.3% | 49.5% |
| Median Age | 38.7 | 39.4 | 38.4 |
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| Population - 2010 | 3,720 | 1,972 | 309,327,143 |
| Population - 2000 | 3,450 | 1,914 | 285,036,114 |
| Population - 1990 | 2,910 | 1,715 | 251,960,433 |
| Pop. 2000 to Now | 10.1% | -0.5% | 15.6% |
| Pop. 1990 to Now | 30.6% | 11.1% | 30.8% |
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| Population Density | 1,533.9 | 735.8 | 93.4 |
| Land Area | 2.5 | 2.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Kiel, WI | Adams, WI | United States |
| Age 0 to 4 | 6.1% | 5.9% | 5.9% |
| Age 5 to 9 | 8.4% | 7.6% | 6.1% |
| Age 10 to 14 | 5.1% | 7.3% | 6.6% |
| Age 15 to 17 | 3.5% | 2.2% | 3.9% |
| Age 18 to 20 | 4.6% | 2.2% | 4.0% |
| Age 21 to 24 | 3.5% | 6.4% | 5.2% |
| Age 25 to 34 | 13.5% | 9.6% | 13.8% |
| Age 35 to 44 | 13.6% | 13.4% | 12.9% |
| Age 45 to 54 | 11.0% | 8.8% | 12.6% |
| Age 55 to 59 | 9.1% | 7.7% | 6.7% |
| Age 60 to 64 | 5.5% | 4.9% | 6.3% |
| Age 65 to 74 | 7.6% | 14.1% | 9.6% |
| Age 75 to 84 | 4.3% | 8.2% | 4.5% |
| Age 85 and over | 4.2% | 1.8% | 1.9% |
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| Race | | | |
| | Kiel, WI | Adams, WI | United States |
| White | 93.0% | 86.0% | 59.4% |
| Black | 0.0% | 0.4% | 12.2% |
| Asian | 0.1% | 6.1% | 5.6% |
| Native American | 0.5% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.6% | 2.9% | 3.2% |
| Hispanic | 2.8% | 4.3% | 18.4% |
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| Marriage & Family | | | |
| | Kiel, WI | Adams, WI | United States |
| Married Population | 48.4% | 40.9% | 49.8% |
| Currently Married | 48.3% | 40.4% | 48.0% |
| Married but Separated | 0.1% | 0.5% | 1.8% |
| Single Population | 51.6% | 59.1% | 50.2% |
| Never Married | 29.8% | 23.9% | 33.8% |
| Divorced | 10.9% | 23.4% | 10.8% |
| Widowed | 10.9% | 11.8% | 5.6% |
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| Household Size | 2.39 | 2.28 | 2.60 |
| Households | 1,620 | 948 | 124,010,992 |
| Family Households | 989 | 476 | 80,755,759 |
| Married couple, w/children | 36.0% | 33.4% | 30.5% |
| Married couple, no children | 39.5% | 38.4% | 42.9% |
| Non Family Households | 631 | 472 | 43,255,233 |
| Single householder, w/children | 14.7% | 19.1% | 15.8% |
| Single householder, no children | 9.8% | 9.0% | 10.8% |