| | De Witt, NY | Fayetteville, NY | United States |
| Population | 25,920 | 4,282 | 329,725,481 |
| Female Population | 49.7% | 53.7% | 50.5% |
| Male Population | 50.3% | 46.3% | 49.5% |
| Median Age | 42.1 | 47.6 | 38.4 |
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| Population - 2010 | 25,911 | 4,225 | 309,327,143 |
| Population - 2000 | 24,071 | 4,190 | 285,036,114 |
| Population - 1990 | 25,148 | 4,248 | 251,960,433 |
| Pop. 2000 to Now | 3.7% | -3.9% | 15.6% |
| Pop. 1990 to Now | -0.7% | -5.2% | 30.8% |
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| Population Density | 767.5 | 2,453.9 | 93.4 |
| Land Area | 33.8 | 1.7 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | De Witt, NY | Fayetteville, NY | United States |
| Age 0 to 4 | 4.7% | 9.7% | 5.9% |
| Age 5 to 9 | 6.1% | 4.3% | 6.1% |
| Age 10 to 14 | 6.5% | 3.9% | 6.6% |
| Age 15 to 17 | 3.5% | 2.2% | 3.9% |
| Age 18 to 20 | 5.3% | 2.3% | 4.0% |
| Age 21 to 24 | 4.5% | 1.8% | 5.2% |
| Age 25 to 34 | 11.6% | 13.5% | 13.8% |
| Age 35 to 44 | 10.4% | 11.0% | 12.9% |
| Age 45 to 54 | 13.5% | 9.4% | 12.6% |
| Age 55 to 59 | 7.1% | 5.3% | 6.7% |
| Age 60 to 64 | 7.9% | 13.2% | 6.3% |
| Age 65 to 74 | 10.5% | 13.3% | 9.6% |
| Age 75 to 84 | 5.4% | 7.7% | 4.5% |
| Age 85 and over | 2.8% | 2.3% | 1.9% |
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| Race | | | |
| | De Witt, NY | Fayetteville, NY | United States |
| White | 78.8% | 89.8% | 59.4% |
| Black | 7.5% | 0.8% | 12.2% |
| Asian | 4.0% | 1.3% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 0.1% | 0.2% | 0.4% |
| Two or More Races | 5.5% | 5.9% | 3.2% |
| Hispanic | 3.8% | 2.0% | 18.4% |
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| Marriage & Family | | | |
| | De Witt, NY | Fayetteville, NY | United States |
| Married Population | 48.2% | 62.0% | 49.8% |
| Currently Married | 46.8% | 62.0% | 48.0% |
| Married but Separated | 1.4% | 0.0% | 1.8% |
| Single Population | 51.8% | 38.0% | 50.2% |
| Never Married | 35.8% | 20.3% | 33.8% |
| Divorced | 9.8% | 10.5% | 10.8% |
| Widowed | 6.2% | 7.1% | 5.6% |
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| Household Size | 2.39 | 2.24 | 2.60 |
| Households | 10,181 | 1,913 | 124,010,992 |
| Family Households | 6,022 | 1,290 | 80,755,759 |
| Married couple, w/children | 32.5% | 27.4% | 30.5% |
| Married couple, no children | 43.8% | 54.4% | 42.9% |
| Non Family Households | 4,159 | 623 | 43,255,233 |
| Single householder, w/children | 13.1% | 14.7% | 15.8% |
| Single householder, no children | 10.6% | 3.6% | 10.8% |