| | Essex, VT | Old Saybrook, CT | United States |
| Population | 21,851 | 10,506 | 329,725,481 |
| Female Population | 51.9% | 56.2% | 50.5% |
| Male Population | 48.1% | 43.8% | 49.5% |
| Median Age | 41.7 | 56.1 | 38.4 |
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| Population - 2010 | 19,639 | 10,238 | 309,327,143 |
| Population - 2000 | 18,626 | 10,367 | 285,036,114 |
| Population - 1990 | 16,498 | 9,552 | 251,960,433 |
| Pop. 2000 to Now | 17.3% | -3.3% | 15.6% |
| Pop. 1990 to Now | 32.4% | 5.0% | 30.8% |
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| Population Density | 562.8 | 697.7 | 93.4 |
| Land Area | 38.8 | 15.1 | 3,531,905.4 |
| Water Area | 0.5 | 6.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Essex, VT | Old Saybrook, CT | United States |
| Age 0 to 4 | 4.8% | 2.6% | 5.9% |
| Age 5 to 9 | 7.2% | 3.3% | 6.1% |
| Age 10 to 14 | 6.9% | 4.7% | 6.6% |
| Age 15 to 17 | 3.3% | 4.9% | 3.9% |
| Age 18 to 20 | 2.7% | 2.5% | 4.0% |
| Age 21 to 24 | 4.7% | 2.9% | 5.2% |
| Age 25 to 34 | 11.8% | 7.6% | 13.8% |
| Age 35 to 44 | 14.4% | 7.5% | 12.9% |
| Age 45 to 54 | 14.3% | 11.6% | 12.6% |
| Age 55 to 59 | 6.1% | 10.1% | 6.7% |
| Age 60 to 64 | 5.8% | 14.5% | 6.3% |
| Age 65 to 74 | 10.2% | 12.9% | 9.6% |
| Age 75 to 84 | 6.7% | 10.9% | 4.5% |
| Age 85 and over | 1.1% | 4.1% | 1.9% |
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| Race | | | |
| | Essex, VT | Old Saybrook, CT | United States |
| White | 86.8% | 93.0% | 59.4% |
| Black | 3.8% | 0.5% | 12.2% |
| Asian | 3.5% | 1.5% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 4.4% | 0.4% | 3.2% |
| Hispanic | 1.3% | 4.5% | 18.4% |
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| Marriage & Family | | | |
| | Essex, VT | Old Saybrook, CT | United States |
| Married Population | 56.7% | 54.4% | 49.8% |
| Currently Married | 56.2% | 53.6% | 48.0% |
| Married but Separated | 0.6% | 0.9% | 1.8% |
| Single Population | 43.3% | 45.6% | 50.2% |
| Never Married | 28.3% | 22.7% | 33.8% |
| Divorced | 9.4% | 15.1% | 10.8% |
| Widowed | 5.5% | 7.8% | 5.6% |
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| Household Size | 2.34 | 2.27 | 2.60 |
| Households | 9,315 | 4,584 | 124,010,992 |
| Family Households | 6,155 | 2,677 | 80,755,759 |
| Married couple, w/children | 33.6% | 21.6% | 30.5% |
| Married couple, no children | 43.3% | 65.6% | 42.9% |
| Non Family Households | 3,160 | 1,907 | 43,255,233 |
| Single householder, w/children | 12.2% | 9.9% | 15.8% |
| Single householder, no children | 10.9% | 3.0% | 10.8% |