| | Old Saybrook, CT | Clinton, CT | United States |
| Population | 10,506 | 13,283 | 329,725,481 |
| Female Population | 56.2% | 49.0% | 50.5% |
| Male Population | 43.8% | 51.0% | 49.5% |
| Median Age | 56.1 | 47.6 | 38.4 |
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| Population - 2010 | 10,238 | 13,242 | 309,327,143 |
| Population - 2000 | 10,367 | 13,094 | 285,036,114 |
| Population - 1990 | 9,552 | 12,767 | 251,960,433 |
| Pop. 2000 to Now | -3.3% | -1.6% | 15.6% |
| Pop. 1990 to Now | 5.0% | 0.9% | 30.8% |
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| Population Density | 697.7 | 819.6 | 93.4 |
| Land Area | 15.1 | 16.2 | 3,531,905.4 |
| Water Area | 6.5 | 2.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Old Saybrook, CT | Clinton, CT | United States |
| Age 0 to 4 | 2.6% | 2.4% | 5.9% |
| Age 5 to 9 | 3.3% | 3.7% | 6.1% |
| Age 10 to 14 | 4.7% | 7.0% | 6.6% |
| Age 15 to 17 | 4.9% | 3.7% | 3.9% |
| Age 18 to 20 | 2.5% | 3.6% | 4.0% |
| Age 21 to 24 | 2.9% | 5.3% | 5.2% |
| Age 25 to 34 | 7.6% | 9.2% | 13.8% |
| Age 35 to 44 | 7.5% | 10.9% | 12.9% |
| Age 45 to 54 | 11.6% | 15.2% | 12.6% |
| Age 55 to 59 | 10.1% | 8.2% | 6.7% |
| Age 60 to 64 | 14.5% | 8.8% | 6.3% |
| Age 65 to 74 | 12.9% | 12.9% | 9.6% |
| Age 75 to 84 | 10.9% | 7.0% | 4.5% |
| Age 85 and over | 4.1% | 2.0% | 1.9% |
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| Race | | | |
| | Old Saybrook, CT | Clinton, CT | United States |
| White | 93.0% | 89.1% | 59.4% |
| Black | 0.5% | 0.1% | 12.2% |
| Asian | 1.5% | 1.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 0.4% | 0.9% | 3.2% |
| Hispanic | 4.5% | 7.8% | 18.4% |
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| Marriage & Family | | | |
| | Old Saybrook, CT | Clinton, CT | United States |
| Married Population | 54.4% | 54.7% | 49.8% |
| Currently Married | 53.6% | 54.3% | 48.0% |
| Married but Separated | 0.9% | 0.3% | 1.8% |
| Single Population | 45.6% | 45.3% | 50.2% |
| Never Married | 22.7% | 29.4% | 33.8% |
| Divorced | 15.1% | 11.6% | 10.8% |
| Widowed | 7.8% | 4.4% | 5.6% |
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| Household Size | 2.27 | 2.44 | 2.60 |
| Households | 4,584 | 5,406 | 124,010,992 |
| Family Households | 2,677 | 3,578 | 80,755,759 |
| Married couple, w/children | 21.6% | 29.2% | 30.5% |
| Married couple, no children | 65.6% | 52.0% | 42.9% |
| Non Family Households | 1,907 | 1,828 | 43,255,233 |
| Single householder, w/children | 9.9% | 8.1% | 15.8% |
| Single householder, no children | 3.0% | 10.7% | 10.8% |