| | East Haddam, CT | Dedham, MA | United States |
| Population | 8,973 | 25,308 | 329,725,481 |
| Female Population | 49.8% | 53.0% | 50.5% |
| Male Population | 50.2% | 47.0% | 49.5% |
| Median Age | 50.3 | 43.1 | 38.4 |
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| Population - 2010 | 9,125 | 24,818 | 309,327,143 |
| Population - 2000 | 8,333 | 23,464 | 285,036,114 |
| Population - 1990 | 6,676 | 23,782 | 251,960,433 |
| Pop. 2000 to Now | 7.5% | 8.0% | 15.6% |
| Pop. 1990 to Now | 34.2% | 6.6% | 30.8% |
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| Population Density | 165.4 | 2,469.8 | 93.4 |
| Land Area | 54.3 | 10.2 | 3,531,905.4 |
| Water Area | 2.3 | 0.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | East Haddam, CT | Dedham, MA | United States |
| Age 0 to 4 | 4.2% | 6.6% | 5.9% |
| Age 5 to 9 | 4.8% | 4.2% | 6.1% |
| Age 10 to 14 | 7.2% | 5.0% | 6.6% |
| Age 15 to 17 | 2.2% | 2.4% | 3.9% |
| Age 18 to 20 | 1.4% | 2.5% | 4.0% |
| Age 21 to 24 | 3.7% | 6.0% | 5.2% |
| Age 25 to 34 | 8.8% | 14.2% | 13.8% |
| Age 35 to 44 | 11.2% | 11.2% | 12.9% |
| Age 45 to 54 | 12.5% | 14.3% | 12.6% |
| Age 55 to 59 | 10.6% | 5.9% | 6.7% |
| Age 60 to 64 | 9.9% | 8.1% | 6.3% |
| Age 65 to 74 | 14.1% | 10.6% | 9.6% |
| Age 75 to 84 | 7.1% | 5.3% | 4.5% |
| Age 85 and over | 2.1% | 3.6% | 1.9% |
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| Race | | | |
| | East Haddam, CT | Dedham, MA | United States |
| White | 95.5% | 79.9% | 59.4% |
| Black | 0.2% | 6.2% | 12.2% |
| Asian | 0.1% | 2.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.2% | 0.5% | 0.4% |
| Two or More Races | 2.1% | 2.8% | 3.2% |
| Hispanic | 2.0% | 7.9% | 18.4% |
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| Marriage & Family | | | |
| | East Haddam, CT | Dedham, MA | United States |
| Married Population | 61.7% | 51.6% | 49.8% |
| Currently Married | 60.6% | 50.9% | 48.0% |
| Married but Separated | 1.1% | 0.7% | 1.8% |
| Single Population | 38.3% | 48.4% | 50.2% |
| Never Married | 20.1% | 31.5% | 33.8% |
| Divorced | 13.6% | 9.5% | 10.8% |
| Widowed | 4.6% | 7.4% | 5.6% |
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| Household Size | 2.32 | 2.34 | 2.60 |
| Households | 3,800 | 10,458 | 124,010,992 |
| Family Households | 2,747 | 6,469 | 80,755,759 |
| Married couple, w/children | 24.4% | 30.5% | 30.5% |
| Married couple, no children | 55.3% | 47.2% | 42.9% |
| Non Family Households | 1,053 | 3,989 | 43,255,233 |
| Single householder, w/children | 9.5% | 12.2% | 15.8% |
| Single householder, no children | 10.7% | 10.0% | 10.8% |