| | Garwood, NJ | Kenilworth, NJ | United States |
| Population | 4,425 | 8,377 | 329,725,481 |
| Female Population | 47.3% | 54.1% | 50.5% |
| Male Population | 52.7% | 45.9% | 49.5% |
| Median Age | 41.4 | 38.5 | 38.4 |
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| Population - 2010 | 4,239 | 7,936 | 309,327,143 |
| Population - 2000 | 4,153 | 7,675 | 285,036,114 |
| Population - 1990 | 4,227 | 7,574 | 251,960,433 |
| Pop. 2000 to Now | 4.1% | 6.2% | 15.6% |
| Pop. 1990 to Now | 2.3% | 7.6% | 30.8% |
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| Population Density | 6,807.7 | 3,901.7 | 93.4 |
| Land Area | 0.7 | 2.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Garwood, NJ | Kenilworth, NJ | United States |
| Age 0 to 4 | 5.5% | 5.2% | 5.9% |
| Age 5 to 9 | 2.6% | 5.2% | 6.1% |
| Age 10 to 14 | 4.4% | 12.8% | 6.6% |
| Age 15 to 17 | 3.3% | 2.3% | 3.9% |
| Age 18 to 20 | 3.3% | 3.0% | 4.0% |
| Age 21 to 24 | 4.8% | 5.6% | 5.2% |
| Age 25 to 34 | 14.4% | 11.7% | 13.8% |
| Age 35 to 44 | 17.1% | 12.1% | 12.9% |
| Age 45 to 54 | 12.6% | 17.5% | 12.6% |
| Age 55 to 59 | 4.6% | 6.4% | 6.7% |
| Age 60 to 64 | 7.6% | 5.0% | 6.3% |
| Age 65 to 74 | 11.1% | 9.4% | 9.6% |
| Age 75 to 84 | 5.4% | 2.7% | 4.5% |
| Age 85 and over | 3.3% | 1.3% | 1.9% |
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| Race | | | |
| | Garwood, NJ | Kenilworth, NJ | United States |
| White | 72.9% | 57.8% | 59.4% |
| Black | 0.0% | 5.4% | 12.2% |
| Asian | 3.2% | 2.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 4.1% | 0.4% |
| Two or More Races | 1.7% | 1.1% | 3.2% |
| Hispanic | 21.8% | 28.8% | 18.4% |
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| Marriage & Family | | | |
| | Garwood, NJ | Kenilworth, NJ | United States |
| Married Population | 52.5% | 51.0% | 49.8% |
| Currently Married | 52.5% | 50.1% | 48.0% |
| Married but Separated | 0.0% | 0.9% | 1.8% |
| Single Population | 47.5% | 49.0% | 50.2% |
| Never Married | 32.8% | 32.9% | 33.8% |
| Divorced | 10.5% | 9.8% | 10.8% |
| Widowed | 4.3% | 6.2% | 5.6% |
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| Household Size | 2.44 | 3.04 | 2.60 |
| Households | 1,814 | 2,755 | 124,010,992 |
| Family Households | 1,116 | 2,096 | 80,755,759 |
| Married couple, w/children | 31.5% | 33.3% | 30.5% |
| Married couple, no children | 52.1% | 32.7% | 42.9% |
| Non Family Households | 698 | 659 | 43,255,233 |
| Single householder, w/children | 7.9% | 14.7% | 15.8% |
| Single householder, no children | 8.6% | 19.3% | 10.8% |