| | Wethersfield, CT | Bayside, WI | United States |
| Population | 27,162 | 4,579 | 329,725,481 |
| Female Population | 51.0% | 56.3% | 50.5% |
| Male Population | 49.1% | 43.7% | 49.5% |
| Median Age | 44.4 | 45.8 | 38.4 |
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| Population - 2010 | 26,671 | 4,407 | 309,327,143 |
| Population - 2000 | 26,271 | 4,518 | 285,036,114 |
| Population - 1990 | 25,651 | 4,789 | 251,960,433 |
| Pop. 2000 to Now | -1.5% | -4.3% | 15.6% |
| Pop. 1990 to Now | 0.9% | -9.7% | 30.8% |
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| Population Density | 2,207.9 | 1,917.5 | 93.4 |
| Land Area | 12.3 | 2.4 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Wethersfield, CT | Bayside, WI | United States |
| Age 0 to 4 | 5.1% | 7.0% | 5.9% |
| Age 5 to 9 | 4.7% | 7.9% | 6.1% |
| Age 10 to 14 | 5.1% | 5.7% | 6.6% |
| Age 15 to 17 | 4.0% | 5.7% | 3.9% |
| Age 18 to 20 | 3.4% | 1.0% | 4.0% |
| Age 21 to 24 | 4.4% | 0.8% | 5.2% |
| Age 25 to 34 | 11.3% | 8.8% | 13.8% |
| Age 35 to 44 | 13.2% | 12.1% | 12.9% |
| Age 45 to 54 | 13.6% | 12.4% | 12.6% |
| Age 55 to 59 | 6.8% | 8.8% | 6.7% |
| Age 60 to 64 | 8.2% | 8.3% | 6.3% |
| Age 65 to 74 | 10.5% | 15.5% | 9.6% |
| Age 75 to 84 | 6.8% | 5.1% | 4.5% |
| Age 85 and over | 2.8% | 1.1% | 1.9% |
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| Race | | | |
| | Wethersfield, CT | Bayside, WI | United States |
| White | 79.0% | 82.6% | 59.4% |
| Black | 3.7% | 1.9% | 12.2% |
| Asian | 3.1% | 7.6% | 5.6% |
| Native American | 0.1% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 5.9% | 3.2% |
| Hispanic | 11.1% | 1.9% | 18.4% |
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| Marriage & Family | | | |
| | Wethersfield, CT | Bayside, WI | United States |
| Married Population | 55.7% | 65.3% | 49.8% |
| Currently Married | 55.2% | 65.3% | 48.0% |
| Married but Separated | 0.5% | 0.0% | 1.8% |
| Single Population | 44.3% | 34.7% | 50.2% |
| Never Married | 28.7% | 20.5% | 33.8% |
| Divorced | 10.2% | 8.0% | 10.8% |
| Widowed | 5.5% | 6.2% | 5.6% |
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| Household Size | 2.38 | 2.45 | 2.60 |
| Households | 11,411 | 1,855 | 124,010,992 |
| Family Households | 7,465 | 1,208 | 80,755,759 |
| Married couple, w/children | 34.1% | 35.8% | 30.5% |
| Married couple, no children | 47.2% | 54.0% | 42.9% |
| Non Family Households | 3,946 | 647 | 43,255,233 |
| Single householder, w/children | 6.8% | 7.9% | 15.8% |
| Single householder, no children | 11.8% | 2.2% | 10.8% |