| | Seneca Falls, NY | Oneida, NY | United States |
| Population | 8,925 | 10,493 | 329,725,481 |
| Female Population | 50.8% | 53.6% | 50.5% |
| Male Population | 49.2% | 46.4% | 49.5% |
| Median Age | 44.8 | 45.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,035 | 11,312 | 309,327,143 |
| Population - 2000 | 9,347 | 10,987 | 285,036,114 |
| Population - 1990 | 9,384 | 10,850 | 251,960,433 |
| Pop. 2000 to Now | -7.8% | -1.5% | 15.6% |
| Pop. 1990 to Now | -8.2% | -0.2% | 30.8% |
| space4 | | | |
| Population Density | 368.5 | 475.8 | 93.4 |
| Land Area | 24.2 | 22.1 | 3,531,905.4 |
| Water Area | 3.2 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Seneca Falls, NY | Oneida, NY | United States |
| Age 0 to 4 | 5.1% | 6.3% | 5.9% |
| Age 5 to 9 | 4.3% | 5.7% | 6.1% |
| Age 10 to 14 | 4.8% | 6.3% | 6.6% |
| Age 15 to 17 | 3.0% | 3.7% | 3.9% |
| Age 18 to 20 | 2.5% | 2.6% | 4.0% |
| Age 21 to 24 | 6.4% | 3.5% | 5.2% |
| Age 25 to 34 | 14.0% | 11.8% | 13.8% |
| Age 35 to 44 | 10.1% | 9.4% | 12.9% |
| Age 45 to 54 | 12.5% | 15.0% | 12.6% |
| Age 55 to 59 | 9.9% | 7.7% | 6.7% |
| Age 60 to 64 | 7.8% | 8.1% | 6.3% |
| Age 65 to 74 | 10.7% | 11.4% | 9.6% |
| Age 75 to 84 | 5.4% | 4.6% | 4.5% |
| Age 85 and over | 3.6% | 4.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Seneca Falls, NY | Oneida, NY | United States |
| White | 89.7% | 91.7% | 59.4% |
| Black | 3.3% | 0.8% | 12.2% |
| Asian | 1.0% | 0.9% | 5.6% |
| Native American | 0.5% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 2.7% | 2.2% | 3.2% |
| Hispanic | 2.9% | 2.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Seneca Falls, NY | Oneida, NY | United States |
| Married Population | 45.4% | 44.9% | 49.8% |
| Currently Married | 43.3% | 41.3% | 48.0% |
| Married but Separated | 2.1% | 3.6% | 1.8% |
| Single Population | 54.6% | 55.1% | 50.2% |
| Never Married | 32.0% | 30.4% | 33.8% |
| Divorced | 14.9% | 16.0% | 10.8% |
| Widowed | 7.8% | 8.6% | 5.6% |
| space5 | | | |
| Household Size | 2.07 | 2.36 | 2.60 |
| Households | 4,207 | 4,368 | 124,010,992 |
| Family Households | 2,241 | 2,258 | 80,755,759 |
| Married couple, w/children | 22.9% | 31.4% | 30.5% |
| Married couple, no children | 49.8% | 42.2% | 42.9% |
| Non Family Households | 1,966 | 2,110 | 43,255,233 |
| Single householder, w/children | 16.0% | 19.6% | 15.8% |
| Single householder, no children | 11.2% | 6.8% | 10.8% |