| | Haddam, CT | East Haddam, CT | United States |
| Population | 8,494 | 8,973 | 329,725,481 |
| Female Population | 47.4% | 49.8% | 50.5% |
| Male Population | 52.6% | 50.2% | 49.5% |
| Median Age | 43.9 | 50.3 | 38.4 |
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| Population - 2010 | 8,345 | 9,125 | 309,327,143 |
| Population - 2000 | 7,157 | 8,333 | 285,036,114 |
| Population - 1990 | 6,769 | 6,676 | 251,960,433 |
| Pop. 2000 to Now | 13.9% | 7.5% | 15.6% |
| Pop. 1990 to Now | 20.4% | 34.2% | 30.8% |
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| Population Density | 193.3 | 165.4 | 93.4 |
| Land Area | 43.9 | 54.3 | 3,531,905.4 |
| Water Area | 2.3 | 2.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Haddam, CT | East Haddam, CT | United States |
| Age 0 to 4 | 2.5% | 4.2% | 5.9% |
| Age 5 to 9 | 9.5% | 4.8% | 6.1% |
| Age 10 to 14 | 5.9% | 7.2% | 6.6% |
| Age 15 to 17 | 3.7% | 2.2% | 3.9% |
| Age 18 to 20 | 2.2% | 1.4% | 4.0% |
| Age 21 to 24 | 2.7% | 3.7% | 5.2% |
| Age 25 to 34 | 7.7% | 8.8% | 13.8% |
| Age 35 to 44 | 16.5% | 11.2% | 12.9% |
| Age 45 to 54 | 14.3% | 12.5% | 12.6% |
| Age 55 to 59 | 6.5% | 10.6% | 6.7% |
| Age 60 to 64 | 9.2% | 9.9% | 6.3% |
| Age 65 to 74 | 11.9% | 14.1% | 9.6% |
| Age 75 to 84 | 5.0% | 7.1% | 4.5% |
| Age 85 and over | 2.2% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Haddam, CT | East Haddam, CT | United States |
| White | 88.1% | 95.5% | 59.4% |
| Black | 1.2% | 0.2% | 12.2% |
| Asian | 5.6% | 0.1% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.9% | 2.1% | 3.2% |
| Hispanic | 3.2% | 2.0% | 18.4% |
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| Marriage & Family | | | |
| | Haddam, CT | East Haddam, CT | United States |
| Married Population | 64.8% | 61.7% | 49.8% |
| Currently Married | 63.4% | 60.6% | 48.0% |
| Married but Separated | 1.4% | 1.1% | 1.8% |
| Single Population | 35.2% | 38.3% | 50.2% |
| Never Married | 20.4% | 20.1% | 33.8% |
| Divorced | 10.0% | 13.6% | 10.8% |
| Widowed | 4.8% | 4.6% | 5.6% |
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| Household Size | 2.72 | 2.32 | 2.60 |
| Households | 3,083 | 3,800 | 124,010,992 |
| Family Households | 2,437 | 2,747 | 80,755,759 |
| Married couple, w/children | 29.9% | 24.4% | 30.5% |
| Married couple, no children | 49.9% | 55.3% | 42.9% |
| Non Family Households | 646 | 1,053 | 43,255,233 |
| Single householder, w/children | 9.4% | 9.5% | 15.8% |
| Single householder, no children | 10.8% | 10.7% | 10.8% |