| | Penn Yan, NY | Rocky Hill, CT | United States |
| Population | 5,268 | 20,682 | 329,725,481 |
| Female Population | 56.4% | 52.6% | 50.5% |
| Male Population | 43.6% | 47.4% | 49.5% |
| Median Age | 46.8 | 44.2 | 38.4 |
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| Population - 2010 | 5,154 | 19,720 | 309,327,143 |
| Population - 2000 | 5,219 | 17,966 | 285,036,114 |
| Population - 1990 | 5,248 | 16,554 | 251,960,433 |
| Pop. 2000 to Now | -5.2% | 11.5% | 15.6% |
| Pop. 1990 to Now | -5.7% | 21.0% | 30.8% |
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| Population Density | 2,204.2 | 1,536.2 | 93.4 |
| Land Area | 2.4 | 13.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Penn Yan, NY | Rocky Hill, CT | United States |
| Age 0 to 4 | 3.3% | 4.4% | 5.9% |
| Age 5 to 9 | 3.4% | 6.8% | 6.1% |
| Age 10 to 14 | 6.6% | 4.1% | 6.6% |
| Age 15 to 17 | 3.9% | 2.7% | 3.9% |
| Age 18 to 20 | 4.4% | 2.6% | 4.0% |
| Age 21 to 24 | 3.9% | 3.8% | 5.2% |
| Age 25 to 34 | 14.0% | 11.9% | 13.8% |
| Age 35 to 44 | 9.0% | 14.8% | 12.9% |
| Age 45 to 54 | 13.3% | 14.0% | 12.6% |
| Age 55 to 59 | 6.4% | 5.7% | 6.7% |
| Age 60 to 64 | 6.0% | 7.1% | 6.3% |
| Age 65 to 74 | 13.7% | 12.2% | 9.6% |
| Age 75 to 84 | 6.8% | 4.4% | 4.5% |
| Age 85 and over | 5.4% | 5.5% | 1.9% |
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| Race | | | |
| | Penn Yan, NY | Rocky Hill, CT | United States |
| White | 89.4% | 67.6% | 59.4% |
| Black | 1.6% | 3.7% | 12.2% |
| Asian | 2.0% | 18.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.8% | 0.4% |
| Two or More Races | 1.9% | 3.2% | 3.2% |
| Hispanic | 5.2% | 6.4% | 18.4% |
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| Marriage & Family | | | |
| | Penn Yan, NY | Rocky Hill, CT | United States |
| Married Population | 36.4% | 55.3% | 49.8% |
| Currently Married | 32.1% | 54.6% | 48.0% |
| Married but Separated | 4.4% | 0.7% | 1.8% |
| Single Population | 63.6% | 44.7% | 50.2% |
| Never Married | 39.9% | 28.7% | 33.8% |
| Divorced | 13.0% | 8.0% | 10.8% |
| Widowed | 10.8% | 7.9% | 5.6% |
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| Household Size | 2.24 | 2.24 | 2.60 |
| Households | 2,214 | 8,894 | 124,010,992 |
| Family Households | 1,022 | 5,593 | 80,755,759 |
| Married couple, w/children | 18.6% | 35.8% | 30.5% |
| Married couple, no children | 43.5% | 44.7% | 42.9% |
| Non Family Households | 1,192 | 3,301 | 43,255,233 |
| Single householder, w/children | 25.7% | 6.1% | 15.8% |
| Single householder, no children | 12.1% | 13.4% | 10.8% |