| | Hillsdale, NY | Poughkeepsie, NY | United States |
| Population | 1,659 | 31,475 | 329,725,481 |
| Female Population | 53.3% | 51.9% | 50.5% |
| Male Population | 46.7% | 48.1% | 49.5% |
| Median Age | 53.4 | 39.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,928 | 30,834 | 309,327,143 |
| Population - 2000 | 1,744 | 29,871 | 285,036,114 |
| Population - 1990 | 1,793 | 28,844 | 251,960,433 |
| Pop. 2000 to Now | 4.0% | 1.9% | 15.6% |
| Pop. 1990 to Now | 1.1% | 5.6% | 30.8% |
| space4 | | | |
| Population Density | 34.8 | 6,118.8 | 93.4 |
| Land Area | 47.7 | 5.1 | 3,531,905.4 |
| Water Area | 0.2 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hillsdale, NY | Poughkeepsie, NY | United States |
| Age 0 to 4 | 3.4% | 4.7% | 5.9% |
| Age 5 to 9 | 4.2% | 4.8% | 6.1% |
| Age 10 to 14 | 5.5% | 5.6% | 6.6% |
| Age 15 to 17 | 2.4% | 3.3% | 3.9% |
| Age 18 to 20 | 1.9% | 2.6% | 4.0% |
| Age 21 to 24 | 2.6% | 6.7% | 5.2% |
| Age 25 to 34 | 11.8% | 17.1% | 13.8% |
| Age 35 to 44 | 6.5% | 13.9% | 12.9% |
| Age 45 to 54 | 17.1% | 12.8% | 12.6% |
| Age 55 to 59 | 10.6% | 5.1% | 6.7% |
| Age 60 to 64 | 9.2% | 6.2% | 6.3% |
| Age 65 to 74 | 11.5% | 10.3% | 9.6% |
| Age 75 to 84 | 6.8% | 4.5% | 4.5% |
| Age 85 and over | 6.7% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hillsdale, NY | Poughkeepsie, NY | United States |
| White | 85.7% | 40.2% | 59.4% |
| Black | 0.0% | 30.9% | 12.2% |
| Asian | 0.0% | 1.0% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.9% | 0.4% |
| Two or More Races | 9.0% | 6.1% | 3.2% |
| Hispanic | 5.0% | 20.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hillsdale, NY | Poughkeepsie, NY | United States |
| Married Population | 52.1% | 34.2% | 49.8% |
| Currently Married | 51.6% | 31.5% | 48.0% |
| Married but Separated | 0.5% | 2.6% | 1.8% |
| Single Population | 47.9% | 65.8% | 50.2% |
| Never Married | 28.4% | 45.1% | 33.8% |
| Divorced | 8.0% | 14.9% | 10.8% |
| Widowed | 11.5% | 5.8% | 5.6% |
| space5 | | | |
| Household Size | 2.27 | 2.21 | 2.60 |
| Households | 730 | 13,815 | 124,010,992 |
| Family Households | 522 | 6,578 | 80,755,759 |
| Married couple, w/children | 13.6% | 20.3% | 30.5% |
| Married couple, no children | 55.7% | 32.8% | 42.9% |
| Non Family Households | 208 | 7,237 | 43,255,233 |
| Single householder, w/children | 13.2% | 31.7% | 15.8% |
| Single householder, no children | 17.4% | 15.3% | 10.8% |