| | Scotch Plains, NJ | New Providence, NJ | United States |
| Population | 24,798 | 13,570 | 329,725,481 |
| Female Population | 50.2% | 51.9% | 50.5% |
| Male Population | 49.8% | 48.1% | 49.5% |
| Median Age | 42.5 | 43.3 | 38.4 |
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| Population - 2010 | 23,691 | 12,224 | 309,327,143 |
| Population - 2000 | 22,732 | 11,907 | 285,036,114 |
| Population - 1990 | 21,160 | 11,439 | 251,960,433 |
| Pop. 2000 to Now | 6.2% | 17.5% | 15.6% |
| Pop. 1990 to Now | 14.1% | 22.3% | 30.8% |
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| Population Density | 2,749.5 | 3,679.5 | 93.4 |
| Land Area | 9.0 | 3.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Scotch Plains, NJ | New Providence, NJ | United States |
| Age 0 to 4 | 5.3% | 5.9% | 5.9% |
| Age 5 to 9 | 7.5% | 7.4% | 6.1% |
| Age 10 to 14 | 7.8% | 8.8% | 6.6% |
| Age 15 to 17 | 4.7% | 4.5% | 3.9% |
| Age 18 to 20 | 1.9% | 2.3% | 4.0% |
| Age 21 to 24 | 4.1% | 3.6% | 5.2% |
| Age 25 to 34 | 9.2% | 7.2% | 13.8% |
| Age 35 to 44 | 12.6% | 13.5% | 12.9% |
| Age 45 to 54 | 16.6% | 14.8% | 12.6% |
| Age 55 to 59 | 8.0% | 7.7% | 6.7% |
| Age 60 to 64 | 5.8% | 4.7% | 6.3% |
| Age 65 to 74 | 9.8% | 12.4% | 9.6% |
| Age 75 to 84 | 5.1% | 4.6% | 4.5% |
| Age 85 and over | 1.5% | 2.6% | 1.9% |
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| Race | | | |
| | Scotch Plains, NJ | New Providence, NJ | United States |
| White | 65.2% | 72.5% | 59.4% |
| Black | 8.3% | 0.7% | 12.2% |
| Asian | 11.7% | 15.2% | 5.6% |
| Native American | 0.5% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 4.1% | 7.2% | 3.2% |
| Hispanic | 9.5% | 4.3% | 18.4% |
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| Marriage & Family | | | |
| | Scotch Plains, NJ | New Providence, NJ | United States |
| Married Population | 60.7% | 65.2% | 49.8% |
| Currently Married | 59.7% | 64.9% | 48.0% |
| Married but Separated | 1.0% | 0.2% | 1.8% |
| Single Population | 39.3% | 34.8% | 50.2% |
| Never Married | 25.2% | 22.0% | 33.8% |
| Divorced | 6.4% | 5.6% | 10.8% |
| Widowed | 7.6% | 7.3% | 5.6% |
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| Household Size | 2.76 | 2.71 | 2.60 |
| Households | 8,935 | 4,944 | 124,010,992 |
| Family Households | 6,799 | 3,670 | 80,755,759 |
| Married couple, w/children | 45.1% | 50.8% | 30.5% |
| Married couple, no children | 38.0% | 39.0% | 42.9% |
| Non Family Households | 2,136 | 1,274 | 43,255,233 |
| Single householder, w/children | 7.7% | 5.5% | 15.8% |
| Single householder, no children | 9.2% | 4.7% | 10.8% |