| | Montville, NJ | Mendham borough, NJ | United States |
| Population | 22,340 | 4,976 | 329,725,481 |
| Female Population | 50.0% | 55.1% | 50.5% |
| Male Population | 50.0% | 44.9% | 49.5% |
| Median Age | 46.2 | 47.7 | 38.4 |
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| Population - 2010 | 21,519 | 4,995 | 309,327,143 |
| Population - 2000 | 20,839 | 5,097 | 285,036,114 |
| Population - 1990 | 15,600 | 4,890 | 251,960,433 |
| Pop. 2000 to Now | 0.6% | -5.1% | 15.6% |
| Pop. 1990 to Now | 34.4% | -1.1% | 30.8% |
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| Population Density | 1,207.6 | 839.0 | 93.4 |
| Land Area | 18.5 | 5.9 | 3,531,905.4 |
| Water Area | 0.6 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Montville, NJ | Mendham borough, NJ | United States |
| Age 0 to 4 | 4.1% | 4.4% | 5.9% |
| Age 5 to 9 | 5.5% | 6.3% | 6.1% |
| Age 10 to 14 | 7.3% | 6.6% | 6.6% |
| Age 15 to 17 | 4.7% | 6.4% | 3.9% |
| Age 18 to 20 | 2.3% | 2.5% | 4.0% |
| Age 21 to 24 | 4.4% | 4.4% | 5.2% |
| Age 25 to 34 | 9.1% | 6.8% | 13.8% |
| Age 35 to 44 | 11.4% | 9.3% | 12.9% |
| Age 45 to 54 | 16.2% | 18.3% | 12.6% |
| Age 55 to 59 | 8.5% | 7.8% | 6.7% |
| Age 60 to 64 | 6.2% | 6.9% | 6.3% |
| Age 65 to 74 | 12.3% | 10.3% | 9.6% |
| Age 75 to 84 | 5.6% | 5.4% | 4.5% |
| Age 85 and over | 2.5% | 4.6% | 1.9% |
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| Race | | | |
| | Montville, NJ | Mendham borough, NJ | United States |
| White | 68.9% | 87.6% | 59.4% |
| Black | 0.7% | 0.9% | 12.2% |
| Asian | 20.5% | 4.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 2.6% | 4.1% | 3.2% |
| Hispanic | 7.0% | 3.2% | 18.4% |
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| Marriage & Family | | | |
| | Montville, NJ | Mendham borough, NJ | United States |
| Married Population | 61.4% | 63.4% | 49.8% |
| Currently Married | 61.3% | 63.2% | 48.0% |
| Married but Separated | 0.2% | 0.1% | 1.8% |
| Single Population | 38.6% | 36.6% | 50.2% |
| Never Married | 26.4% | 24.0% | 33.8% |
| Divorced | 6.5% | 8.6% | 10.8% |
| Widowed | 5.6% | 4.0% | 5.6% |
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| Household Size | 2.81 | 2.68 | 2.60 |
| Households | 7,897 | 1,753 | 124,010,992 |
| Family Households | 6,085 | 1,405 | 80,755,759 |
| Married couple, w/children | 38.8% | 37.8% | 30.5% |
| Married couple, no children | 51.5% | 51.2% | 42.9% |
| Non Family Households | 1,812 | 348 | 43,255,233 |
| Single householder, w/children | 3.4% | 6.0% | 15.8% |
| Single householder, no children | 6.3% | 5.0% | 10.8% |