| | Tenafly, NJ | Harrington Park, NJ | United States |
| Population | 15,307 | 4,801 | 329,725,481 |
| Female Population | 49.5% | 52.6% | 50.5% |
| Male Population | 50.5% | 47.5% | 49.5% |
| Median Age | 41.9 | 46.1 | 38.4 |
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| Population - 2010 | 14,539 | 4,672 | 309,327,143 |
| Population - 2000 | 13,806 | 4,740 | 285,036,114 |
| Population - 1990 | 13,326 | 4,623 | 251,960,433 |
| Pop. 2000 to Now | 3.6% | -1.0% | 15.6% |
| Pop. 1990 to Now | 7.3% | 1.5% | 30.8% |
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| Population Density | 3,337.8 | 2,600.8 | 93.4 |
| Land Area | 4.6 | 1.8 | 3,531,905.4 |
| Water Area | 0.6 | 0.2 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Tenafly, NJ | Harrington Park, NJ | United States |
| Age 0 to 4 | 2.9% | 7.4% | 5.9% |
| Age 5 to 9 | 11.0% | 6.4% | 6.1% |
| Age 10 to 14 | 13.7% | 6.7% | 6.6% |
| Age 15 to 17 | 5.1% | 5.2% | 3.9% |
| Age 18 to 20 | 2.3% | 1.0% | 4.0% |
| Age 21 to 24 | 2.3% | 3.6% | 5.2% |
| Age 25 to 34 | 4.7% | 6.4% | 13.8% |
| Age 35 to 44 | 16.4% | 11.2% | 12.9% |
| Age 45 to 54 | 16.9% | 14.6% | 12.6% |
| Age 55 to 59 | 6.6% | 13.6% | 6.7% |
| Age 60 to 64 | 4.8% | 5.3% | 6.3% |
| Age 65 to 74 | 7.8% | 5.0% | 9.6% |
| Age 75 to 84 | 2.7% | 7.4% | 4.5% |
| Age 85 and over | 2.8% | 6.3% | 1.9% |
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| Race | | | |
| | Tenafly, NJ | Harrington Park, NJ | United States |
| White | 54.9% | 70.8% | 59.4% |
| Black | 0.8% | 0.0% | 12.2% |
| Asian | 32.1% | 21.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.8% | 0.4% |
| Two or More Races | 1.6% | 3.0% | 3.2% |
| Hispanic | 10.2% | 4.4% | 18.4% |
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| Marriage & Family | | | |
| | Tenafly, NJ | Harrington Park, NJ | United States |
| Married Population | 70.2% | 74.0% | 49.8% |
| Currently Married | 69.7% | 74.0% | 48.0% |
| Married but Separated | 0.5% | 0.0% | 1.8% |
| Single Population | 29.8% | 26.0% | 50.2% |
| Never Married | 20.8% | 17.3% | 33.8% |
| Divorced | 4.9% | 5.3% | 10.8% |
| Widowed | 4.1% | 3.4% | 5.6% |
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| Household Size | 3.05 | 2.76 | 2.60 |
| Households | 4,981 | 1,737 | 124,010,992 |
| Family Households | 4,287 | 1,503 | 80,755,759 |
| Married couple, w/children | 53.3% | 36.0% | 30.5% |
| Married couple, no children | 32.2% | 55.2% | 42.9% |
| Non Family Households | 694 | 234 | 43,255,233 |
| Single householder, w/children | 8.2% | 6.5% | 15.8% |
| Single householder, no children | 6.3% | 2.3% | 10.8% |