| | Cornwall, CT | Windsor, CT | United States |
| Population | 1,379 | 29,424 | 329,725,481 |
| Female Population | 51.0% | 51.2% | 50.5% |
| Male Population | 49.0% | 48.9% | 49.5% |
| Median Age | 53.9 | 44.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,419 | 29,112 | 309,327,143 |
| Population - 2000 | 1,434 | 28,237 | 285,036,114 |
| Population - 1990 | 1,414 | 27,817 | 251,960,433 |
| Pop. 2000 to Now | -5.2% | 1.5% | 15.6% |
| Pop. 1990 to Now | -3.8% | 3.0% | 30.8% |
| space4 | | | |
| Population Density | 29.9 | 997.3 | 93.4 |
| Land Area | 46.1 | 29.5 | 3,531,905.4 |
| Water Area | 0.3 | 1.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Cornwall, CT | Windsor, CT | United States |
| Age 0 to 4 | 2.7% | 4.3% | 5.9% |
| Age 5 to 9 | 4.6% | 4.3% | 6.1% |
| Age 10 to 14 | 3.0% | 6.4% | 6.6% |
| Age 15 to 17 | 3.4% | 4.3% | 3.9% |
| Age 18 to 20 | 3.8% | 2.8% | 4.0% |
| Age 21 to 24 | 3.8% | 5.0% | 5.2% |
| Age 25 to 34 | 5.8% | 13.2% | 13.8% |
| Age 35 to 44 | 4.9% | 10.4% | 12.9% |
| Age 45 to 54 | 20.3% | 14.0% | 12.6% |
| Age 55 to 59 | 6.7% | 8.3% | 6.7% |
| Age 60 to 64 | 12.4% | 8.1% | 6.3% |
| Age 65 to 74 | 18.4% | 11.5% | 9.6% |
| Age 75 to 84 | 7.7% | 5.1% | 4.5% |
| Age 85 and over | 2.5% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cornwall, CT | Windsor, CT | United States |
| White | 87.4% | 43.8% | 59.4% |
| Black | 0.6% | 36.3% | 12.2% |
| Asian | 4.4% | 4.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 1.9% | 4.3% | 3.2% |
| Hispanic | 5.8% | 10.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Cornwall, CT | Windsor, CT | United States |
| Married Population | 58.6% | 48.5% | 49.8% |
| Currently Married | 58.4% | 47.3% | 48.0% |
| Married but Separated | 0.2% | 1.2% | 1.8% |
| Single Population | 41.4% | 51.5% | 50.2% |
| Never Married | 23.1% | 35.2% | 33.8% |
| Divorced | 11.6% | 11.2% | 10.8% |
| Widowed | 6.6% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.19 | 2.56 | 2.60 |
| Households | 629 | 11,278 | 124,010,992 |
| Family Households | 418 | 7,732 | 80,755,759 |
| Married couple, w/children | 16.5% | 27.4% | 30.5% |
| Married couple, no children | 70.3% | 44.3% | 42.9% |
| Non Family Households | 211 | 3,546 | 43,255,233 |
| Single householder, w/children | 8.4% | 15.2% | 15.8% |
| Single householder, no children | 4.8% | 13.1% | 10.8% |