| | Montague, NJ | Selden, NY | United States |
| Population | 3,780 | 21,265 | 329,725,481 |
| Female Population | 45.0% | 50.6% | 50.5% |
| Male Population | 55.0% | 49.4% | 49.5% |
| Median Age | 44.1 | 40.5 | 38.4 |
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| Population - 2010 | 3,865 | 19,592 | 309,327,143 |
| Population - 2000 | 3,412 | 21,861 | 285,036,114 |
| Population - 1990 | 2,832 | 20,608 | 251,960,433 |
| Pop. 2000 to Now | 6.4% | -9.9% | 15.6% |
| Pop. 1990 to Now | 28.2% | -4.5% | 30.8% |
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| Population Density | 83.8 | 4,921.3 | 93.4 |
| Land Area | 45.1 | 4.3 | 3,531,905.4 |
| Water Area | 1.4 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Montague, NJ | Selden, NY | United States |
| Age 0 to 4 | 5.6% | 3.8% | 5.9% |
| Age 5 to 9 | 5.8% | 5.1% | 6.1% |
| Age 10 to 14 | 6.0% | 6.2% | 6.6% |
| Age 15 to 17 | 3.5% | 4.6% | 3.9% |
| Age 18 to 20 | 3.5% | 4.5% | 4.0% |
| Age 21 to 24 | 1.3% | 4.8% | 5.2% |
| Age 25 to 34 | 12.8% | 13.5% | 13.8% |
| Age 35 to 44 | 13.1% | 12.7% | 12.9% |
| Age 45 to 54 | 10.2% | 14.7% | 12.6% |
| Age 55 to 59 | 7.1% | 6.1% | 6.7% |
| Age 60 to 64 | 8.8% | 7.3% | 6.3% |
| Age 65 to 74 | 18.1% | 9.5% | 9.6% |
| Age 75 to 84 | 3.6% | 5.5% | 4.5% |
| Age 85 and over | 0.6% | 1.9% | 1.9% |
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| Race | | | |
| | Montague, NJ | Selden, NY | United States |
| White | 87.9% | 69.0% | 59.4% |
| Black | 0.4% | 3.6% | 12.2% |
| Asian | 4.9% | 5.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.2% | 0.5% | 0.4% |
| Two or More Races | 0.8% | 2.7% | 3.2% |
| Hispanic | 4.8% | 18.4% | 18.4% |
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| Marriage & Family | | | |
| | Montague, NJ | Selden, NY | United States |
| Married Population | 60.9% | 49.7% | 49.8% |
| Currently Married | 60.9% | 47.6% | 48.0% |
| Married but Separated | 0.0% | 2.0% | 1.8% |
| Single Population | 39.1% | 50.3% | 50.2% |
| Never Married | 25.8% | 35.5% | 33.8% |
| Divorced | 6.5% | 8.0% | 10.8% |
| Widowed | 6.7% | 6.9% | 5.6% |
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| Household Size | 2.52 | 3.14 | 2.60 |
| Households | 1,485 | 6,772 | 124,010,992 |
| Family Households | 997 | 5,335 | 80,755,759 |
| Married couple, w/children | 33.4% | 33.1% | 30.5% |
| Married couple, no children | 56.0% | 37.9% | 42.9% |
| Non Family Households | 488 | 1,437 | 43,255,233 |
| Single householder, w/children | 3.2% | 10.5% | 15.8% |
| Single householder, no children | 7.4% | 18.5% | 10.8% |