| | Seaford, NY | Canandaigua, NY | United States |
| Population | 15,636 | 10,563 | 329,725,481 |
| Female Population | 49.2% | 52.7% | 50.5% |
| Male Population | 50.8% | 47.3% | 49.5% |
| Median Age | 41.8 | 41.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 15,463 | 10,557 | 309,327,143 |
| Population - 2000 | 15,791 | 11,264 | 285,036,114 |
| Population - 1990 | 15,597 | 10,725 | 251,960,433 |
| Pop. 2000 to Now | -2.7% | -9.9% | 15.6% |
| Pop. 1990 to Now | -1.5% | -5.3% | 30.8% |
| space4 | | | |
| Population Density | 5,990.8 | 2,308.9 | 93.4 |
| Land Area | 2.6 | 4.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Seaford, NY | Canandaigua, NY | United States |
| Age 0 to 4 | 4.4% | 4.1% | 5.9% |
| Age 5 to 9 | 5.9% | 4.5% | 6.1% |
| Age 10 to 14 | 7.4% | 4.1% | 6.6% |
| Age 15 to 17 | 5.8% | 4.7% | 3.9% |
| Age 18 to 20 | 4.3% | 3.7% | 4.0% |
| Age 21 to 24 | 5.4% | 8.5% | 5.2% |
| Age 25 to 34 | 9.7% | 12.0% | 13.8% |
| Age 35 to 44 | 11.0% | 12.0% | 12.9% |
| Age 45 to 54 | 15.5% | 13.4% | 12.6% |
| Age 55 to 59 | 8.1% | 5.2% | 6.7% |
| Age 60 to 64 | 5.9% | 6.7% | 6.3% |
| Age 65 to 74 | 9.1% | 11.4% | 9.6% |
| Age 75 to 84 | 4.8% | 6.4% | 4.5% |
| Age 85 and over | 2.8% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Seaford, NY | Canandaigua, NY | United States |
| White | 88.0% | 86.6% | 59.4% |
| Black | 0.9% | 1.3% | 12.2% |
| Asian | 3.7% | 0.3% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 0.9% | 3.0% | 3.2% |
| Hispanic | 6.3% | 8.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Seaford, NY | Canandaigua, NY | United States |
| Married Population | 58.0% | 39.4% | 49.8% |
| Currently Married | 57.2% | 37.4% | 48.0% |
| Married but Separated | 0.9% | 2.0% | 1.8% |
| Single Population | 42.0% | 60.6% | 50.2% |
| Never Married | 29.3% | 37.8% | 33.8% |
| Divorced | 7.4% | 13.0% | 10.8% |
| Widowed | 5.2% | 9.8% | 5.6% |
| space5 | | | |
| Household Size | 3.03 | 2.01 | 2.60 |
| Households | 5,136 | 5,132 | 124,010,992 |
| Family Households | 4,288 | 2,460 | 80,755,759 |
| Married couple, w/children | 41.1% | 27.2% | 30.5% |
| Married couple, no children | 42.6% | 39.4% | 42.9% |
| Non Family Households | 848 | 2,672 | 43,255,233 |
| Single householder, w/children | 7.2% | 19.4% | 15.8% |
| Single householder, no children | 9.1% | 14.0% | 10.8% |