| | Alfred, NY | Hempstead, NY | United States |
| Population | 5,637 | 791,018 | 329,725,481 |
| Female Population | 47.2% | 51.0% | 50.5% |
| Male Population | 52.8% | 49.0% | 49.5% |
| Median Age | 20.5 | 40.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,240 | 760,725 | 309,327,143 |
| Population - 2000 | 5,140 | 755,924 | 285,036,114 |
| Population - 1990 | 5,791 | 725,639 | 251,960,433 |
| Pop. 2000 to Now | -4.5% | 1.1% | 15.6% |
| Pop. 1990 to Now | -15.2% | 5.3% | 30.8% |
| space4 | | | |
| Population Density | 179.1 | 6,670.1 | 93.4 |
| Land Area | 31.5 | 118.6 | 3,531,905.4 |
| Water Area | 0.1 | 73.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Alfred, NY | Hempstead, NY | United States |
| Age 0 to 4 | 1.4% | 5.7% | 5.9% |
| Age 5 to 9 | 2.7% | 5.9% | 6.1% |
| Age 10 to 14 | 1.7% | 6.3% | 6.6% |
| Age 15 to 17 | 1.4% | 4.0% | 3.9% |
| Age 18 to 20 | 49.2% | 3.8% | 4.0% |
| Age 21 to 24 | 19.9% | 5.2% | 5.2% |
| Age 25 to 34 | 7.6% | 12.2% | 13.8% |
| Age 35 to 44 | 2.4% | 12.6% | 12.9% |
| Age 45 to 54 | 2.3% | 13.6% | 12.6% |
| Age 55 to 59 | 2.2% | 7.3% | 6.7% |
| Age 60 to 64 | 2.1% | 6.7% | 6.3% |
| Age 65 to 74 | 4.7% | 9.9% | 9.6% |
| Age 75 to 84 | 1.8% | 4.5% | 4.5% |
| Age 85 and over | 0.7% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Alfred, NY | Hempstead, NY | United States |
| White | 79.8% | 52.4% | 59.4% |
| Black | 8.8% | 16.5% | 12.2% |
| Asian | 2.8% | 6.9% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.5% | 0.7% | 0.4% |
| Two or More Races | 0.9% | 2.5% | 3.2% |
| Hispanic | 7.0% | 21.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Alfred, NY | Hempstead, NY | United States |
| Married Population | 15.8% | 52.8% | 49.8% |
| Currently Married | 15.2% | 51.3% | 48.0% |
| Married but Separated | 0.6% | 1.5% | 1.8% |
| Single Population | 84.2% | 47.2% | 50.2% |
| Never Married | 78.7% | 34.5% | 33.8% |
| Divorced | 3.9% | 7.0% | 10.8% |
| Widowed | 1.6% | 5.7% | 5.6% |
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| Household Size | 2.51 | 3.14 | 2.60 |
| Households | 840 | 248,907 | 124,010,992 |
| Family Households | 454 | 194,787 | 80,755,759 |
| Married couple, w/children | 38.3% | 35.3% | 30.5% |
| Married couple, no children | 47.6% | 40.7% | 42.9% |
| Non Family Households | 386 | 54,120 | 43,255,233 |
| Single householder, w/children | 10.4% | 10.9% | 15.8% |
| Single householder, no children | 3.7% | 13.1% | 10.8% |