| | Suffern, NY | New Fairfield, CT | United States |
| Population | 11,376 | 13,640 | 329,725,481 |
| Female Population | 53.3% | 50.6% | 50.5% |
| Male Population | 46.7% | 49.4% | 49.5% |
| Median Age | 44.6 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,744 | 13,908 | 309,327,143 |
| Population - 2000 | 11,006 | 13,953 | 285,036,114 |
| Population - 1990 | 11,055 | 12,911 | 251,960,433 |
| Pop. 2000 to Now | -0.3% | -1.2% | 15.6% |
| Pop. 1990 to Now | -0.8% | 6.8% | 30.8% |
| space4 | | | |
| Population Density | 5,424.9 | 667.2 | 93.4 |
| Land Area | 2.1 | 20.4 | 3,531,905.4 |
| Water Area | 0.0 | 4.7 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Suffern, NY | New Fairfield, CT | United States |
| Age 0 to 4 | 4.3% | 6.9% | 5.9% |
| Age 5 to 9 | 5.1% | 5.7% | 6.1% |
| Age 10 to 14 | 5.9% | 6.8% | 6.6% |
| Age 15 to 17 | 4.6% | 5.5% | 3.9% |
| Age 18 to 20 | 2.4% | 4.1% | 4.0% |
| Age 21 to 24 | 4.1% | 7.0% | 5.2% |
| Age 25 to 34 | 11.3% | 7.7% | 13.8% |
| Age 35 to 44 | 12.6% | 9.3% | 12.9% |
| Age 45 to 54 | 15.0% | 14.1% | 12.6% |
| Age 55 to 59 | 8.7% | 7.3% | 6.7% |
| Age 60 to 64 | 5.5% | 8.7% | 6.3% |
| Age 65 to 74 | 11.6% | 10.3% | 9.6% |
| Age 75 to 84 | 6.6% | 5.3% | 4.5% |
| Age 85 and over | 2.2% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Suffern, NY | New Fairfield, CT | United States |
| White | 57.8% | 85.1% | 59.4% |
| Black | 13.8% | 0.4% | 12.2% |
| Asian | 6.9% | 1.6% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.9% | 0.4% |
| Two or More Races | 3.1% | 4.4% | 3.2% |
| Hispanic | 18.1% | 7.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Suffern, NY | New Fairfield, CT | United States |
| Married Population | 48.7% | 60.4% | 49.8% |
| Currently Married | 46.4% | 60.0% | 48.0% |
| Married but Separated | 2.3% | 0.4% | 1.8% |
| Single Population | 51.3% | 39.6% | 50.2% |
| Never Married | 32.3% | 27.4% | 33.8% |
| Divorced | 13.1% | 8.4% | 10.8% |
| Widowed | 5.9% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 2.36 | 3.02 | 2.60 |
| Households | 4,715 | 4,503 | 124,010,992 |
| Family Households | 2,750 | 3,642 | 80,755,759 |
| Married couple, w/children | 30.2% | 35.7% | 30.5% |
| Married couple, no children | 45.6% | 51.5% | 42.9% |
| Non Family Households | 1,965 | 861 | 43,255,233 |
| Single householder, w/children | 13.2% | 7.9% | 15.8% |
| Single householder, no children | 10.9% | 4.8% | 10.8% |