| | Manalapan, NJ | Monroe township (Middlesex County), NJ | United States |
| Population | 40,637 | 47,549 | 329,725,481 |
| Female Population | 50.3% | 51.6% | 50.5% |
| Male Population | 49.7% | 48.4% | 49.5% |
| Median Age | 43.8 | 55.8 | 38.4 |
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| Population - 2010 | 39,078 | 39,418 | 309,327,143 |
| Population - 2000 | 33,423 | 27,999 | 285,036,114 |
| Population - 1990 | 26,716 | 22,255 | 251,960,433 |
| Pop. 2000 to Now | 17.4% | 60.3% | 15.6% |
| Pop. 1990 to Now | 46.8% | 101.7% | 30.8% |
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| Population Density | 1,327.7 | 1,132.8 | 93.4 |
| Land Area | 30.6 | 42.0 | 3,531,905.4 |
| Water Area | 0.2 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Manalapan, NJ | Monroe township (Middlesex County), NJ | United States |
| Age 0 to 4 | 4.8% | 3.2% | 5.9% |
| Age 5 to 9 | 6.3% | 5.1% | 6.1% |
| Age 10 to 14 | 6.8% | 6.3% | 6.6% |
| Age 15 to 17 | 4.6% | 3.3% | 3.9% |
| Age 18 to 20 | 2.4% | 1.3% | 4.0% |
| Age 21 to 24 | 4.4% | 2.5% | 5.2% |
| Age 25 to 34 | 8.4% | 4.4% | 13.8% |
| Age 35 to 44 | 13.9% | 10.7% | 12.9% |
| Age 45 to 54 | 14.9% | 12.4% | 12.6% |
| Age 55 to 59 | 9.2% | 6.0% | 6.7% |
| Age 60 to 64 | 8.0% | 7.2% | 6.3% |
| Age 65 to 74 | 9.9% | 18.7% | 9.6% |
| Age 75 to 84 | 4.5% | 12.5% | 4.5% |
| Age 85 and over | 1.8% | 6.4% | 1.9% |
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| Race | | | |
| | Manalapan, NJ | Monroe township (Middlesex County), NJ | United States |
| White | 80.9% | 68.7% | 59.4% |
| Black | 3.1% | 2.7% | 12.2% |
| Asian | 6.1% | 20.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.1% | 0.4% |
| Two or More Races | 1.2% | 2.2% | 3.2% |
| Hispanic | 8.5% | 6.2% | 18.4% |
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| Marriage & Family | | | |
| | Manalapan, NJ | Monroe township (Middlesex County), NJ | United States |
| Married Population | 64.2% | 63.7% | 49.8% |
| Currently Married | 61.9% | 63.3% | 48.0% |
| Married but Separated | 2.2% | 0.5% | 1.8% |
| Single Population | 35.8% | 36.3% | 50.2% |
| Never Married | 24.5% | 15.7% | 33.8% |
| Divorced | 5.9% | 7.7% | 10.8% |
| Widowed | 5.5% | 12.9% | 5.6% |
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| Household Size | 2.78 | 2.31 | 2.60 |
| Households | 14,572 | 20,386 | 124,010,992 |
| Family Households | 11,023 | 13,692 | 80,755,759 |
| Married couple, w/children | 42.5% | 30.6% | 30.5% |
| Married couple, no children | 47.2% | 60.2% | 42.9% |
| Non Family Households | 3,549 | 6,694 | 43,255,233 |
| Single householder, w/children | 3.1% | 4.9% | 15.8% |
| Single householder, no children | 7.3% | 4.3% | 10.8% |