| | Yorktown Heights, NY | Deerfield, IL | United States |
| Population | 1,953 | 19,228 | 329,725,481 |
| Female Population | 48.5% | 50.4% | 50.5% |
| Male Population | 51.5% | 49.6% | 49.5% |
| Median Age | 52.3 | 44.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,669 | 18,245 | 309,327,143 |
| Population - 2000 | 7,972 | 18,420 | 285,036,114 |
| Population - 1990 | 7,690 | 17,327 | 251,960,433 |
| Pop. 2000 to Now | -79.7% | 0.6% | 15.6% |
| Pop. 1990 to Now | -79.0% | 7.0% | 30.8% |
| space4 | | | |
| Population Density | 2,136.8 | 3,477.0 | 93.4 |
| Land Area | 0.9 | 5.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Yorktown Heights, NY | Deerfield, IL | United States |
| Age 0 to 4 | 2.5% | 3.8% | 5.9% |
| Age 5 to 9 | 8.6% | 7.8% | 6.1% |
| Age 10 to 14 | 1.0% | 8.1% | 6.6% |
| Age 15 to 17 | 1.4% | 4.8% | 3.9% |
| Age 18 to 20 | 1.0% | 2.6% | 4.0% |
| Age 21 to 24 | 3.3% | 3.7% | 5.2% |
| Age 25 to 34 | 14.4% | 7.9% | 13.8% |
| Age 35 to 44 | 13.5% | 12.6% | 12.9% |
| Age 45 to 54 | 5.9% | 15.0% | 12.6% |
| Age 55 to 59 | 12.4% | 8.2% | 6.7% |
| Age 60 to 64 | 6.9% | 8.3% | 6.3% |
| Age 65 to 74 | 18.9% | 8.7% | 9.6% |
| Age 75 to 84 | 8.4% | 4.9% | 4.5% |
| Age 85 and over | 1.8% | 3.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Yorktown Heights, NY | Deerfield, IL | United States |
| White | 72.4% | 88.2% | 59.4% |
| Black | 0.1% | 0.4% | 12.2% |
| Asian | 2.2% | 5.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 2.0% | 3.2% |
| Hispanic | 25.3% | 4.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Yorktown Heights, NY | Deerfield, IL | United States |
| Married Population | 58.6% | 67.1% | 49.8% |
| Currently Married | 57.7% | 67.0% | 48.0% |
| Married but Separated | 0.8% | 0.1% | 1.8% |
| Single Population | 41.4% | 32.9% | 50.2% |
| Never Married | 29.5% | 20.1% | 33.8% |
| Divorced | 11.1% | 7.6% | 10.8% |
| Widowed | 0.9% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.55 | 2.56 | 2.60 |
| Households | 765 | 7,475 | 124,010,992 |
| Family Households | 597 | 5,634 | 80,755,759 |
| Married couple, w/children | 23.6% | 38.0% | 30.5% |
| Married couple, no children | 59.0% | 52.8% | 42.9% |
| Non Family Households | 168 | 1,841 | 43,255,233 |
| Single householder, w/children | 2.3% | 6.6% | 15.8% |
| Single householder, no children | 15.1% | 2.6% | 10.8% |