| | Old Tappan, NJ | Cresskill, NJ | United States |
| Population | 5,870 | 9,096 | 329,725,481 |
| Female Population | 49.3% | 56.5% | 50.5% |
| Male Population | 50.8% | 43.5% | 49.5% |
| Median Age | 44.5 | 44.6 | 38.4 |
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| Population - 2010 | 5,753 | 8,547 | 309,327,143 |
| Population - 2000 | 5,482 | 7,746 | 285,036,114 |
| Population - 1990 | 4,254 | 7,558 | 251,960,433 |
| Pop. 2000 to Now | 7.1% | 11.4% | 15.6% |
| Pop. 1990 to Now | 38.0% | 14.1% | 30.8% |
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| Population Density | 1,770.7 | 4,404.8 | 93.4 |
| Land Area | 3.3 | 2.1 | 3,531,905.4 |
| Water Area | 0.8 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Old Tappan, NJ | Cresskill, NJ | United States |
| Age 0 to 4 | 4.8% | 3.4% | 5.9% |
| Age 5 to 9 | 7.5% | 8.8% | 6.1% |
| Age 10 to 14 | 8.2% | 8.4% | 6.6% |
| Age 15 to 17 | 5.9% | 5.3% | 3.9% |
| Age 18 to 20 | 1.2% | 1.8% | 4.0% |
| Age 21 to 24 | 4.4% | 4.9% | 5.2% |
| Age 25 to 34 | 7.7% | 5.0% | 13.8% |
| Age 35 to 44 | 10.6% | 13.4% | 12.9% |
| Age 45 to 54 | 17.0% | 17.3% | 12.6% |
| Age 55 to 59 | 7.7% | 7.5% | 6.7% |
| Age 60 to 64 | 7.7% | 7.9% | 6.3% |
| Age 65 to 74 | 9.9% | 9.3% | 9.6% |
| Age 75 to 84 | 5.4% | 2.4% | 4.5% |
| Age 85 and over | 1.9% | 4.6% | 1.9% |
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| Race | | | |
| | Old Tappan, NJ | Cresskill, NJ | United States |
| White | 55.0% | 56.4% | 59.4% |
| Black | 0.0% | 0.1% | 12.2% |
| Asian | 35.6% | 34.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 0.8% | 3.2% |
| Hispanic | 6.7% | 8.6% | 18.4% |
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| Marriage & Family | | | |
| | Old Tappan, NJ | Cresskill, NJ | United States |
| Married Population | 68.1% | 62.6% | 49.8% |
| Currently Married | 68.1% | 62.1% | 48.0% |
| Married but Separated | 0.0% | 0.5% | 1.8% |
| Single Population | 31.9% | 37.4% | 50.2% |
| Never Married | 23.2% | 22.1% | 33.8% |
| Divorced | 5.6% | 7.7% | 10.8% |
| Widowed | 3.1% | 7.6% | 5.6% |
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| Household Size | 3.05 | 2.96 | 2.60 |
| Households | 1,923 | 3,036 | 124,010,992 |
| Family Households | 1,680 | 2,496 | 80,755,759 |
| Married couple, w/children | 47.1% | 47.1% | 30.5% |
| Married couple, no children | 42.6% | 41.9% | 42.9% |
| Non Family Households | 243 | 540 | 43,255,233 |
| Single householder, w/children | 3.0% | 3.3% | 15.8% |
| Single householder, no children | 7.3% | 7.7% | 10.8% |