| | Elmwood Park, NJ | Mount Arlington, NJ | United States |
| Population | 21,239 | 5,812 | 329,725,481 |
| Female Population | 53.7% | 58.4% | 50.5% |
| Male Population | 46.3% | 41.6% | 49.5% |
| Median Age | 39.2 | 44.8 | 38.4 |
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| Population - 2010 | 19,510 | 5,040 | 309,327,143 |
| Population - 2000 | 18,925 | 4,663 | 285,036,114 |
| Population - 1990 | 17,623 | 3,630 | 251,960,433 |
| Pop. 2000 to Now | 5.0% | 24.9% | 15.6% |
| Pop. 1990 to Now | 12.7% | 60.5% | 30.8% |
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| Population Density | 8,035.9 | 2,715.9 | 93.4 |
| Land Area | 2.6 | 2.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Elmwood Park, NJ | Mount Arlington, NJ | United States |
| Age 0 to 4 | 6.5% | 7.6% | 5.9% |
| Age 5 to 9 | 5.6% | 4.6% | 6.1% |
| Age 10 to 14 | 5.9% | 4.6% | 6.6% |
| Age 15 to 17 | 4.5% | 3.5% | 3.9% |
| Age 18 to 20 | 3.9% | 2.9% | 4.0% |
| Age 21 to 24 | 5.7% | 5.5% | 5.2% |
| Age 25 to 34 | 12.9% | 12.3% | 13.8% |
| Age 35 to 44 | 12.5% | 10.0% | 12.9% |
| Age 45 to 54 | 13.3% | 17.4% | 12.6% |
| Age 55 to 59 | 6.9% | 5.7% | 6.7% |
| Age 60 to 64 | 6.2% | 7.4% | 6.3% |
| Age 65 to 74 | 9.6% | 11.1% | 9.6% |
| Age 75 to 84 | 4.1% | 4.4% | 4.5% |
| Age 85 and over | 2.3% | 3.1% | 1.9% |
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| Race | | | |
| | Elmwood Park, NJ | Mount Arlington, NJ | United States |
| White | 53.2% | 80.9% | 59.4% |
| Black | 6.0% | 3.7% | 12.2% |
| Asian | 11.1% | 1.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.6% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 0.7% | 3.2% |
| Hispanic | 26.8% | 13.8% | 18.4% |
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| Marriage & Family | | | |
| | Elmwood Park, NJ | Mount Arlington, NJ | United States |
| Married Population | 51.6% | 47.7% | 49.8% |
| Currently Married | 49.7% | 46.4% | 48.0% |
| Married but Separated | 1.9% | 1.3% | 1.8% |
| Single Population | 48.4% | 52.3% | 50.2% |
| Never Married | 35.9% | 29.1% | 33.8% |
| Divorced | 7.0% | 15.5% | 10.8% |
| Widowed | 5.5% | 7.7% | 5.6% |
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| Household Size | 2.98 | 2.55 | 2.60 |
| Households | 7,121 | 2,281 | 124,010,992 |
| Family Households | 5,337 | 1,431 | 80,755,759 |
| Married couple, w/children | 30.2% | 35.7% | 30.5% |
| Married couple, no children | 39.7% | 38.1% | 42.9% |
| Non Family Households | 1,784 | 850 | 43,255,233 |
| Single householder, w/children | 18.0% | 8.2% | 15.8% |
| Single householder, no children | 12.1% | 18.0% | 10.8% |