| | Hornellsville, NY | Cohocton, NY | United States |
| Population | 4,037 | 2,393 | 329,725,481 |
| Female Population | 53.7% | 47.9% | 50.5% |
| Male Population | 46.3% | 52.1% | 49.5% |
| Median Age | 51.3 | 44.7 | 38.4 |
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| Population - 2010 | 4,153 | 2,568 | 309,327,143 |
| Population - 2000 | 4,042 | 2,626 | 285,036,114 |
| Population - 1990 | 4,149 | 2,520 | 251,960,433 |
| Pop. 2000 to Now | -2.3% | -7.7% | 15.6% |
| Pop. 1990 to Now | -4.8% | -3.8% | 30.8% |
| space4 | | | |
| Population Density | 93.2 | 42.7 | 93.4 |
| Land Area | 43.3 | 56.1 | 3,531,905.4 |
| Water Area | 0.2 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hornellsville, NY | Cohocton, NY | United States |
| Age 0 to 4 | 6.3% | 3.8% | 5.9% |
| Age 5 to 9 | 4.0% | 5.6% | 6.1% |
| Age 10 to 14 | 4.4% | 6.1% | 6.6% |
| Age 15 to 17 | 2.5% | 6.2% | 3.9% |
| Age 18 to 20 | 2.6% | 2.1% | 4.0% |
| Age 21 to 24 | 2.2% | 4.7% | 5.2% |
| Age 25 to 34 | 11.4% | 10.6% | 13.8% |
| Age 35 to 44 | 9.2% | 11.2% | 12.9% |
| Age 45 to 54 | 15.1% | 12.2% | 12.6% |
| Age 55 to 59 | 7.7% | 10.6% | 6.7% |
| Age 60 to 64 | 8.6% | 7.7% | 6.3% |
| Age 65 to 74 | 12.4% | 12.2% | 9.6% |
| Age 75 to 84 | 7.0% | 5.5% | 4.5% |
| Age 85 and over | 6.7% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hornellsville, NY | Cohocton, NY | United States |
| White | 95.1% | 95.6% | 59.4% |
| Black | 0.3% | 0.9% | 12.2% |
| Asian | 0.6% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 1.4% | 3.1% | 3.2% |
| Hispanic | 2.5% | 0.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hornellsville, NY | Cohocton, NY | United States |
| Married Population | 53.4% | 55.2% | 49.8% |
| Currently Married | 51.0% | 52.0% | 48.0% |
| Married but Separated | 2.5% | 3.2% | 1.8% |
| Single Population | 46.6% | 44.8% | 50.2% |
| Never Married | 21.6% | 28.4% | 33.8% |
| Divorced | 15.1% | 11.2% | 10.8% |
| Widowed | 9.8% | 5.2% | 5.6% |
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| Household Size | 2.23 | 2.45 | 2.60 |
| Households | 1,767 | 967 | 124,010,992 |
| Family Households | 1,131 | 731 | 80,755,759 |
| Married couple, w/children | 21.8% | 21.6% | 30.5% |
| Married couple, no children | 53.4% | 47.5% | 42.9% |
| Non Family Households | 636 | 236 | 43,255,233 |
| Single householder, w/children | 16.1% | 23.3% | 15.8% |
| Single householder, no children | 8.7% | 7.7% | 10.8% |