| | New Hartford, CT | Haddam, CT | United States |
| Population | 6,685 | 8,494 | 329,725,481 |
| Female Population | 46.6% | 47.4% | 50.5% |
| Male Population | 53.5% | 52.6% | 49.5% |
| Median Age | 47.1 | 43.9 | 38.4 |
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| Population - 2010 | 6,965 | 8,345 | 309,327,143 |
| Population - 2000 | 6,088 | 7,157 | 285,036,114 |
| Population - 1990 | 5,769 | 6,769 | 251,960,433 |
| Pop. 2000 to Now | 9.1% | 13.9% | 15.6% |
| Pop. 1990 to Now | 15.1% | 20.4% | 30.8% |
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| Population Density | 180.5 | 193.3 | 93.4 |
| Land Area | 37.0 | 43.9 | 3,531,905.4 |
| Water Area | 1.1 | 2.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | New Hartford, CT | Haddam, CT | United States |
| Age 0 to 4 | 7.0% | 2.5% | 5.9% |
| Age 5 to 9 | 3.7% | 9.5% | 6.1% |
| Age 10 to 14 | 8.3% | 5.9% | 6.6% |
| Age 15 to 17 | 6.0% | 3.7% | 3.9% |
| Age 18 to 20 | 4.4% | 2.2% | 4.0% |
| Age 21 to 24 | 1.7% | 2.7% | 5.2% |
| Age 25 to 34 | 6.8% | 7.7% | 13.8% |
| Age 35 to 44 | 10.8% | 16.5% | 12.9% |
| Age 45 to 54 | 16.6% | 14.3% | 12.6% |
| Age 55 to 59 | 10.0% | 6.5% | 6.7% |
| Age 60 to 64 | 9.4% | 9.2% | 6.3% |
| Age 65 to 74 | 9.2% | 11.9% | 9.6% |
| Age 75 to 84 | 4.7% | 5.0% | 4.5% |
| Age 85 and over | 1.4% | 2.2% | 1.9% |
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| Race | | | |
| | New Hartford, CT | Haddam, CT | United States |
| White | 94.2% | 88.1% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 1.6% | 5.6% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.1% | 0.0% | 0.4% |
| Two or More Races | 1.7% | 1.9% | 3.2% |
| Hispanic | 1.3% | 3.2% | 18.4% |
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| Marriage & Family | | | |
| | New Hartford, CT | Haddam, CT | United States |
| Married Population | 58.5% | 64.8% | 49.8% |
| Currently Married | 57.1% | 63.4% | 48.0% |
| Married but Separated | 1.4% | 1.4% | 1.8% |
| Single Population | 41.5% | 35.2% | 50.2% |
| Never Married | 24.9% | 20.4% | 33.8% |
| Divorced | 9.5% | 10.0% | 10.8% |
| Widowed | 7.1% | 4.8% | 5.6% |
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| Household Size | 2.55 | 2.72 | 2.60 |
| Households | 2,620 | 3,083 | 124,010,992 |
| Family Households | 1,777 | 2,437 | 80,755,759 |
| Married couple, w/children | 37.6% | 29.9% | 30.5% |
| Married couple, no children | 47.7% | 49.9% | 42.9% |
| Non Family Households | 843 | 646 | 43,255,233 |
| Single householder, w/children | 8.3% | 9.4% | 15.8% |
| Single householder, no children | 6.3% | 10.8% | 10.8% |