| | Hillburn, NY | Valley Cottage, NY | United States |
| Population | 1,110 | 8,749 | 329,725,481 |
| Female Population | 56.9% | 50.7% | 50.5% |
| Male Population | 43.1% | 49.3% | 49.5% |
| Median Age | 33.3 | 51 | 38.4 |
| space3 | | | |
| Population - 2010 | 963 | 9,448 | 309,327,143 |
| Population - 2000 | 881 | 9,269 | 285,036,114 |
| Population - 1990 | 892 | 9,007 | 251,960,433 |
| Pop. 2000 to Now | 11.2% | 11.5% | 15.6% |
| Pop. 1990 to Now | 9.9% | 14.7% | 30.8% |
| space4 | | | |
| Population Density | 496.4 | 2,017.3 | 93.4 |
| Land Area | 2.2 | 4.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hillburn, NY | Valley Cottage, NY | United States |
| Age 0 to 4 | 10.3% | 3.4% | 5.9% |
| Age 5 to 9 | 5.9% | 4.3% | 6.1% |
| Age 10 to 14 | 8.6% | 4.1% | 6.6% |
| Age 15 to 17 | 4.7% | 2.7% | 3.9% |
| Age 18 to 20 | 5.4% | 3.7% | 4.0% |
| Age 21 to 24 | 5.3% | 2.5% | 5.2% |
| Age 25 to 34 | 12.3% | 13.6% | 13.8% |
| Age 35 to 44 | 11.4% | 8.6% | 12.9% |
| Age 45 to 54 | 15.1% | 14.6% | 12.6% |
| Age 55 to 59 | 4.0% | 10.3% | 6.7% |
| Age 60 to 64 | 2.6% | 6.6% | 6.3% |
| Age 65 to 74 | 7.7% | 16.4% | 9.6% |
| Age 75 to 84 | 5.9% | 5.6% | 4.5% |
| Age 85 and over | 0.9% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hillburn, NY | Valley Cottage, NY | United States |
| White | 38.7% | 66.7% | 59.4% |
| Black | 14.5% | 7.5% | 12.2% |
| Asian | 6.0% | 10.2% | 5.6% |
| Native American | 4.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.3% | 0.4% |
| Two or More Races | 5.4% | 2.1% | 3.2% |
| Hispanic | 30.9% | 13.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hillburn, NY | Valley Cottage, NY | United States |
| Married Population | 49.7% | 56.4% | 49.8% |
| Currently Married | 46.8% | 56.0% | 48.0% |
| Married but Separated | 2.9% | 0.4% | 1.8% |
| Single Population | 50.3% | 43.6% | 50.2% |
| Never Married | 35.8% | 29.3% | 33.8% |
| Divorced | 5.7% | 8.3% | 10.8% |
| Widowed | 8.7% | 6.0% | 5.6% |
| space5 | | | |
| Household Size | 3.41 | 2.45 | 2.60 |
| Households | 324 | 3,462 | 124,010,992 |
| Family Households | 238 | 2,384 | 80,755,759 |
| Married couple, w/children | 34.9% | 26.6% | 30.5% |
| Married couple, no children | 37.4% | 55.6% | 42.9% |
| Non Family Households | 86 | 1,078 | 43,255,233 |
| Single householder, w/children | 17.6% | 5.0% | 15.8% |
| Single householder, no children | 10.1% | 12.8% | 10.8% |