| | Rumson, NJ | Saddle River, NJ | United States |
| Population | 7,292 | 3,362 | 329,725,481 |
| Female Population | 48.0% | 53.2% | 50.5% |
| Male Population | 52.0% | 46.8% | 49.5% |
| Median Age | 42.7 | 51 | 38.4 |
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| Population - 2010 | 7,072 | 3,162 | 309,327,143 |
| Population - 2000 | 7,137 | 3,201 | 285,036,114 |
| Population - 1990 | 6,701 | 2,950 | 251,960,433 |
| Pop. 2000 to Now | -6.5% | -1.4% | 15.6% |
| Pop. 1990 to Now | -0.5% | 7.0% | 30.8% |
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| Population Density | 1,439.1 | 684.2 | 93.4 |
| Land Area | 5.1 | 4.9 | 3,531,905.4 |
| Water Area | 2.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Rumson, NJ | Saddle River, NJ | United States |
| Age 0 to 4 | 3.5% | 3.2% | 5.9% |
| Age 5 to 9 | 9.2% | 4.8% | 6.1% |
| Age 10 to 14 | 11.2% | 5.3% | 6.6% |
| Age 15 to 17 | 6.3% | 4.1% | 3.9% |
| Age 18 to 20 | 4.0% | 1.0% | 4.0% |
| Age 21 to 24 | 6.1% | 5.2% | 5.2% |
| Age 25 to 34 | 2.9% | 6.4% | 13.8% |
| Age 35 to 44 | 10.6% | 11.7% | 12.9% |
| Age 45 to 54 | 17.6% | 14.3% | 12.6% |
| Age 55 to 59 | 10.0% | 10.5% | 6.7% |
| Age 60 to 64 | 5.7% | 7.6% | 6.3% |
| Age 65 to 74 | 7.2% | 13.4% | 9.6% |
| Age 75 to 84 | 4.8% | 5.8% | 4.5% |
| Age 85 and over | 0.9% | 6.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Rumson, NJ | Saddle River, NJ | United States |
| White | 92.8% | 74.9% | 59.4% |
| Black | 0.5% | 3.5% | 12.2% |
| Asian | 1.7% | 12.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.3% | 0.2% |
| Other | 0.4% | 1.2% | 0.4% |
| Two or More Races | 1.5% | 2.6% | 3.2% |
| Hispanic | 3.1% | 5.5% | 18.4% |
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| Marriage & Family | | | |
| | Rumson, NJ | Saddle River, NJ | United States |
| Married Population | 65.9% | 67.9% | 49.8% |
| Currently Married | 64.9% | 65.8% | 48.0% |
| Married but Separated | 1.0% | 2.1% | 1.8% |
| Single Population | 34.1% | 32.1% | 50.2% |
| Never Married | 26.3% | 18.0% | 33.8% |
| Divorced | 5.3% | 7.7% | 10.8% |
| Widowed | 2.5% | 6.4% | 5.6% |
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| Household Size | 3.21 | 2.50 | 2.60 |
| Households | 2,265 | 1,341 | 124,010,992 |
| Family Households | 1,935 | 1,060 | 80,755,759 |
| Married couple, w/children | 46.9% | 43.9% | 30.5% |
| Married couple, no children | 43.1% | 44.4% | 42.9% |
| Non Family Households | 330 | 281 | 43,255,233 |
| Single householder, w/children | 4.7% | 5.8% | 15.8% |
| Single householder, no children | 5.3% | 5.9% | 10.8% |