| | Colchester, CT | Green Bay, WI | United States |
| Population | 15,552 | 107,083 | 329,725,481 |
| Female Population | 48.3% | 50.8% | 50.5% |
| Male Population | 51.7% | 49.3% | 49.5% |
| Median Age | 42.7 | 35.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 16,011 | 103,939 | 309,327,143 |
| Population - 2000 | 14,551 | 102,313 | 285,036,114 |
| Population - 1990 | 10,980 | 96,466 | 251,960,433 |
| Pop. 2000 to Now | 8.4% | 1.5% | 15.6% |
| Pop. 1990 to Now | 43.7% | 7.6% | 30.8% |
| space4 | | | |
| Population Density | 317.5 | 2,354.4 | 93.4 |
| Land Area | 49.0 | 45.5 | 3,531,905.4 |
| Water Area | 0.7 | 10.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Colchester, CT | Green Bay, WI | United States |
| Age 0 to 4 | 7.7% | 7.1% | 5.9% |
| Age 5 to 9 | 3.9% | 6.8% | 6.1% |
| Age 10 to 14 | 7.2% | 6.2% | 6.6% |
| Age 15 to 17 | 4.5% | 4.0% | 3.9% |
| Age 18 to 20 | 2.1% | 4.8% | 4.0% |
| Age 21 to 24 | 3.4% | 5.7% | 5.2% |
| Age 25 to 34 | 10.3% | 14.7% | 13.8% |
| Age 35 to 44 | 13.2% | 13.0% | 12.9% |
| Age 45 to 54 | 14.2% | 12.3% | 12.6% |
| Age 55 to 59 | 10.5% | 6.4% | 6.7% |
| Age 60 to 64 | 7.4% | 5.7% | 6.3% |
| Age 65 to 74 | 8.8% | 7.7% | 9.6% |
| Age 75 to 84 | 5.2% | 3.7% | 4.5% |
| Age 85 and over | 1.7% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Colchester, CT | Green Bay, WI | United States |
| White | 87.2% | 67.8% | 59.4% |
| Black | 2.9% | 4.3% | 12.2% |
| Asian | 1.2% | 3.8% | 5.6% |
| Native American | 0.0% | 2.6% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.1% | 0.4% |
| Two or More Races | 3.4% | 4.7% | 3.2% |
| Hispanic | 5.0% | 16.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Colchester, CT | Green Bay, WI | United States |
| Married Population | 61.1% | 43.4% | 49.8% |
| Currently Married | 59.8% | 42.2% | 48.0% |
| Married but Separated | 1.2% | 1.2% | 1.8% |
| Single Population | 38.9% | 56.6% | 50.2% |
| Never Married | 22.9% | 37.4% | 33.8% |
| Divorced | 11.6% | 14.0% | 10.8% |
| Widowed | 4.4% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.52 | 2.36 | 2.60 |
| Households | 6,097 | 43,887 | 124,010,992 |
| Family Households | 4,436 | 24,694 | 80,755,759 |
| Married couple, w/children | 33.0% | 28.9% | 30.5% |
| Married couple, no children | 48.9% | 40.0% | 42.9% |
| Non Family Households | 1,661 | 19,193 | 43,255,233 |
| Single householder, w/children | 13.0% | 23.1% | 15.8% |
| Single householder, no children | 5.0% | 8.0% | 10.8% |