| | South Dayton, NY | Union City, PA | United States |
| Population | 593 | 2,976 | 329,725,481 |
| Female Population | 50.3% | 58.5% | 50.5% |
| Male Population | 49.8% | 41.5% | 49.5% |
| Median Age | 33.1 | 46.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 619 | 3,327 | 309,327,143 |
| Population - 2000 | 662 | 3,463 | 285,036,114 |
| Population - 1990 | 601 | 3,537 | 251,960,433 |
| Pop. 2000 to Now | -13.1% | -10.6% | 15.6% |
| Pop. 1990 to Now | -4.3% | -12.4% | 30.8% |
| space4 | | | |
| Population Density | 589.5 | 1,626.2 | 93.4 |
| Land Area | 1.0 | 1.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | South Dayton, NY | Union City, PA | United States |
| Age 0 to 4 | 5.9% | 6.4% | 5.9% |
| Age 5 to 9 | 8.9% | 4.8% | 6.1% |
| Age 10 to 14 | 6.6% | 3.5% | 6.6% |
| Age 15 to 17 | 8.4% | 4.4% | 3.9% |
| Age 18 to 20 | 3.2% | 3.7% | 4.0% |
| Age 21 to 24 | 6.1% | 6.0% | 5.2% |
| Age 25 to 34 | 12.1% | 12.6% | 13.8% |
| Age 35 to 44 | 10.6% | 6.3% | 12.9% |
| Age 45 to 54 | 13.0% | 15.4% | 12.6% |
| Age 55 to 59 | 4.9% | 5.8% | 6.7% |
| Age 60 to 64 | 7.4% | 7.3% | 6.3% |
| Age 65 to 74 | 8.6% | 11.9% | 9.6% |
| Age 75 to 84 | 2.7% | 9.2% | 4.5% |
| Age 85 and over | 1.5% | 2.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | South Dayton, NY | Union City, PA | United States |
| White | 94.4% | 94.2% | 59.4% |
| Black | 1.9% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 2.2% | 3.2% |
| Hispanic | 1.3% | 3.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | South Dayton, NY | Union City, PA | United States |
| Married Population | 34.5% | 47.1% | 49.8% |
| Currently Married | 33.3% | 43.1% | 48.0% |
| Married but Separated | 1.3% | 4.1% | 1.8% |
| Single Population | 65.5% | 52.9% | 50.2% |
| Never Married | 41.2% | 28.2% | 33.8% |
| Divorced | 19.7% | 10.8% | 10.8% |
| Widowed | 4.5% | 13.9% | 5.6% |
| space5 | | | |
| Household Size | 2.58 | 2.19 | 2.60 |
| Households | 230 | 1,360 | 124,010,992 |
| Family Households | 150 | 716 | 80,755,759 |
| Married couple, w/children | 18.7% | 32.0% | 30.5% |
| Married couple, no children | 30.7% | 38.8% | 42.9% |
| Non Family Households | 80 | 644 | 43,255,233 |
| Single householder, w/children | 33.3% | 11.9% | 15.8% |
| Single householder, no children | 17.3% | 17.3% | 10.8% |