| | Emerson, NJ | River Vale, NJ | United States |
| Population | 7,317 | 9,888 | 329,725,481 |
| Female Population | 52.4% | 47.9% | 50.5% |
| Male Population | 47.6% | 52.1% | 49.5% |
| Median Age | 47.5 | 45.1 | 38.4 |
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| Population - 2010 | 7,394 | 9,678 | 309,327,143 |
| Population - 2000 | 7,197 | 9,449 | 285,036,114 |
| Population - 1990 | 6,930 | 9,410 | 251,960,433 |
| Pop. 2000 to Now | 5.1% | 5.3% | 15.6% |
| Pop. 1990 to Now | 9.1% | 5.7% | 30.8% |
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| Population Density | 3,279.7 | 2,465.2 | 93.4 |
| Land Area | 2.2 | 4.0 | 3,531,905.4 |
| Water Area | 0.2 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Emerson, NJ | River Vale, NJ | United States |
| Age 0 to 4 | 4.8% | 4.5% | 5.9% |
| Age 5 to 9 | 3.6% | 5.9% | 6.1% |
| Age 10 to 14 | 7.6% | 11.1% | 6.6% |
| Age 15 to 17 | 3.3% | 4.3% | 3.9% |
| Age 18 to 20 | 3.3% | 2.9% | 4.0% |
| Age 21 to 24 | 3.8% | 4.5% | 5.2% |
| Age 25 to 34 | 7.6% | 7.3% | 13.8% |
| Age 35 to 44 | 12.5% | 9.4% | 12.9% |
| Age 45 to 54 | 16.0% | 16.3% | 12.6% |
| Age 55 to 59 | 9.4% | 9.8% | 6.7% |
| Age 60 to 64 | 5.4% | 6.2% | 6.3% |
| Age 65 to 74 | 14.9% | 10.4% | 9.6% |
| Age 75 to 84 | 4.2% | 4.4% | 4.5% |
| Age 85 and over | 3.7% | 3.1% | 1.9% |
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| Race | | | |
| | Emerson, NJ | River Vale, NJ | United States |
| White | 75.7% | 75.6% | 59.4% |
| Black | 0.8% | 0.2% | 12.2% |
| Asian | 13.0% | 12.4% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.0% | 3.3% | 3.2% |
| Hispanic | 9.4% | 8.3% | 18.4% |
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| Marriage & Family | | | |
| | Emerson, NJ | River Vale, NJ | United States |
| Married Population | 68.3% | 67.4% | 49.8% |
| Currently Married | 67.5% | 66.9% | 48.0% |
| Married but Separated | 0.8% | 0.5% | 1.8% |
| Single Population | 31.7% | 32.6% | 50.2% |
| Never Married | 20.6% | 22.2% | 33.8% |
| Divorced | 4.7% | 5.1% | 10.8% |
| Widowed | 6.5% | 5.4% | 5.6% |
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| Household Size | 2.79 | 2.89 | 2.60 |
| Households | 2,537 | 3,402 | 124,010,992 |
| Family Households | 2,110 | 2,774 | 80,755,759 |
| Married couple, w/children | 34.5% | 41.0% | 30.5% |
| Married couple, no children | 58.1% | 49.0% | 42.9% |
| Non Family Households | 427 | 628 | 43,255,233 |
| Single householder, w/children | 2.3% | 4.7% | 15.8% |
| Single householder, no children | 5.1% | 5.3% | 10.8% |