| | Mansfield, CT | Middletown, CT | United States |
| Population | 26,431 | 47,164 | 329,725,481 |
| Female Population | 52.4% | 51.5% | 50.5% |
| Male Population | 47.6% | 48.5% | 49.5% |
| Median Age | 21.1 | 39.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 27,078 | 47,659 | 309,327,143 |
| Population - 2000 | 20,720 | 43,167 | 285,036,114 |
| Population - 1990 | 21,103 | 42,762 | 251,960,433 |
| Pop. 2000 to Now | 22.7% | 6.6% | 15.6% |
| Pop. 1990 to Now | 20.4% | 7.6% | 30.8% |
| space4 | | | |
| Population Density | 592.6 | 1,149.8 | 93.4 |
| Land Area | 44.6 | 41.0 | 3,531,905.4 |
| Water Area | 1.0 | 1.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mansfield, CT | Middletown, CT | United States |
| Age 0 to 4 | 0.9% | 3.9% | 5.9% |
| Age 5 to 9 | 1.9% | 4.5% | 6.1% |
| Age 10 to 14 | 2.8% | 4.4% | 6.6% |
| Age 15 to 17 | 2.8% | 2.7% | 3.9% |
| Age 18 to 20 | 40.5% | 7.2% | 4.0% |
| Age 21 to 24 | 21.9% | 6.9% | 5.2% |
| Age 25 to 34 | 5.4% | 15.7% | 13.8% |
| Age 35 to 44 | 4.6% | 11.1% | 12.9% |
| Age 45 to 54 | 4.4% | 12.4% | 12.6% |
| Age 55 to 59 | 2.8% | 7.8% | 6.7% |
| Age 60 to 64 | 2.8% | 7.1% | 6.3% |
| Age 65 to 74 | 5.3% | 9.1% | 9.6% |
| Age 75 to 84 | 2.6% | 4.8% | 4.5% |
| Age 85 and over | 1.3% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mansfield, CT | Middletown, CT | United States |
| White | 76.3% | 66.2% | 59.4% |
| Black | 3.9% | 13.3% | 12.2% |
| Asian | 11.4% | 5.6% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.1% | 0.4% |
| Two or More Races | 2.0% | 3.9% | 3.2% |
| Hispanic | 6.1% | 10.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mansfield, CT | Middletown, CT | United States |
| Married Population | 19.2% | 39.5% | 49.8% |
| Currently Married | 18.9% | 38.8% | 48.0% |
| Married but Separated | 0.3% | 0.7% | 1.8% |
| Single Population | 80.8% | 60.5% | 50.2% |
| Never Married | 74.5% | 42.1% | 33.8% |
| Divorced | 4.1% | 12.9% | 10.8% |
| Widowed | 2.2% | 5.4% | 5.6% |
| space5 | | | |
| Household Size | 2.17 | 2.14 | 2.60 |
| Households | 6,482 | 20,089 | 124,010,992 |
| Family Households | 2,872 | 10,531 | 80,755,759 |
| Married couple, w/children | 27.2% | 22.8% | 30.5% |
| Married couple, no children | 47.1% | 46.7% | 42.9% |
| Non Family Households | 3,610 | 9,558 | 43,255,233 |
| Single householder, w/children | 12.3% | 18.1% | 15.8% |
| Single householder, no children | 13.4% | 12.4% | 10.8% |