| | Bethany, CT | Prospect, CT | United States |
| Population | 5,331 | 9,361 | 329,725,481 |
| Female Population | 51.5% | 50.8% | 50.5% |
| Male Population | 48.6% | 49.2% | 49.5% |
| Median Age | 42.8 | 47.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,565 | 9,451 | 309,327,143 |
| Population - 2000 | 5,040 | 8,707 | 285,036,114 |
| Population - 1990 | 4,608 | 7,775 | 251,960,433 |
| Pop. 2000 to Now | 9.4% | 12.0% | 15.6% |
| Pop. 1990 to Now | 19.6% | 25.5% | 30.8% |
| space4 | | | |
| Population Density | 252.6 | 657.1 | 93.4 |
| Land Area | 21.1 | 14.2 | 3,531,905.4 |
| Water Area | 0.4 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Bethany, CT | Prospect, CT | United States |
| Age 0 to 4 | 6.3% | 3.6% | 5.9% |
| Age 5 to 9 | 6.6% | 5.3% | 6.1% |
| Age 10 to 14 | 5.7% | 8.1% | 6.6% |
| Age 15 to 17 | 1.1% | 4.3% | 3.9% |
| Age 18 to 20 | 2.2% | 1.9% | 4.0% |
| Age 21 to 24 | 8.7% | 3.9% | 5.2% |
| Age 25 to 34 | 8.1% | 5.9% | 13.8% |
| Age 35 to 44 | 15.2% | 12.0% | 12.9% |
| Age 45 to 54 | 15.9% | 14.9% | 12.6% |
| Age 55 to 59 | 6.3% | 10.5% | 6.7% |
| Age 60 to 64 | 6.2% | 7.6% | 6.3% |
| Age 65 to 74 | 9.1% | 12.6% | 9.6% |
| Age 75 to 84 | 5.6% | 5.4% | 4.5% |
| Age 85 and over | 3.1% | 3.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Bethany, CT | Prospect, CT | United States |
| White | 89.2% | 89.4% | 59.4% |
| Black | 1.4% | 3.2% | 12.2% |
| Asian | 5.3% | 0.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.1% | 3.3% | 3.2% |
| Hispanic | 2.0% | 3.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Bethany, CT | Prospect, CT | United States |
| Married Population | 67.5% | 61.0% | 49.8% |
| Currently Married | 67.5% | 60.8% | 48.0% |
| Married but Separated | 0.0% | 0.2% | 1.8% |
| Single Population | 32.5% | 39.0% | 50.2% |
| Never Married | 24.6% | 21.7% | 33.8% |
| Divorced | 5.0% | 8.4% | 10.8% |
| Widowed | 2.8% | 9.0% | 5.6% |
| space5 | | | |
| Household Size | 3.01 | 2.85 | 2.60 |
| Households | 1,768 | 3,238 | 124,010,992 |
| Family Households | 1,528 | 2,467 | 80,755,759 |
| Married couple, w/children | 34.9% | 32.8% | 30.5% |
| Married couple, no children | 56.5% | 53.2% | 42.9% |
| Non Family Households | 240 | 771 | 43,255,233 |
| Single householder, w/children | 1.7% | 6.4% | 15.8% |
| Single householder, no children | 6.9% | 7.6% | 10.8% |