| | Unity, NH | Watertown, CT | United States |
| Population | 1,490 | 22,110 | 329,725,481 |
| Female Population | 51.0% | 49.4% | 50.5% |
| Male Population | 49.0% | 50.6% | 49.5% |
| Median Age | 56.4 | 46.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,669 | 22,532 | 309,327,143 |
| Population - 2000 | 1,530 | 21,661 | 285,036,114 |
| Population - 1990 | 1,341 | 20,456 | 251,960,433 |
| Pop. 2000 to Now | 5.6% | -0.7% | 15.6% |
| Pop. 1990 to Now | 20.5% | 5.2% | 30.8% |
| space4 | | | |
| Population Density | 40.4 | 762.3 | 93.4 |
| Land Area | 36.9 | 29.0 | 3,531,905.4 |
| Water Area | 0.3 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Unity, NH | Watertown, CT | United States |
| Age 0 to 4 | 0.5% | 3.5% | 5.9% |
| Age 5 to 9 | 3.5% | 4.8% | 6.1% |
| Age 10 to 14 | 7.0% | 5.4% | 6.6% |
| Age 15 to 17 | 0.8% | 3.1% | 3.9% |
| Age 18 to 20 | 3.6% | 3.1% | 4.0% |
| Age 21 to 24 | 5.0% | 4.2% | 5.2% |
| Age 25 to 34 | 7.9% | 13.3% | 13.8% |
| Age 35 to 44 | 7.1% | 10.7% | 12.9% |
| Age 45 to 54 | 12.5% | 15.6% | 12.6% |
| Age 55 to 59 | 9.9% | 7.7% | 6.7% |
| Age 60 to 64 | 9.1% | 6.4% | 6.3% |
| Age 65 to 74 | 17.7% | 11.3% | 9.6% |
| Age 75 to 84 | 7.8% | 6.5% | 4.5% |
| Age 85 and over | 7.8% | 4.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Unity, NH | Watertown, CT | United States |
| White | 93.7% | 85.2% | 59.4% |
| Black | 1.3% | 1.3% | 12.2% |
| Asian | 0.1% | 1.8% | 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 | 1.1% | 1.5% | 3.2% |
| Hispanic | 3.9% | 10.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Unity, NH | Watertown, CT | United States |
| Married Population | 51.0% | 49.9% | 49.8% |
| Currently Married | 49.2% | 49.4% | 48.0% |
| Married but Separated | 1.7% | 0.5% | 1.8% |
| Single Population | 49.0% | 50.1% | 50.2% |
| Never Married | 23.2% | 31.4% | 33.8% |
| Divorced | 15.8% | 9.2% | 10.8% |
| Widowed | 10.0% | 9.5% | 5.6% |
| space5 | | | |
| Household Size | 2.55 | 2.50 | 2.60 |
| Households | 485 | 8,735 | 124,010,992 |
| Family Households | 347 | 6,027 | 80,755,759 |
| Married couple, w/children | 6.6% | 28.0% | 30.5% |
| Married couple, no children | 80.7% | 46.5% | 42.9% |
| Non Family Households | 138 | 2,708 | 43,255,233 |
| Single householder, w/children | 8.1% | 8.3% | 15.8% |
| Single householder, no children | 4.6% | 17.2% | 10.8% |