| | Montville, CT | Morris, CT | United States |
| Population | 18,607 | 2,149 | 329,725,481 |
| Female Population | 45.2% | 50.7% | 50.5% |
| Male Population | 54.8% | 49.3% | 49.5% |
| Median Age | 42.6 | 47.2 | 38.4 |
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| Population - 2010 | 19,589 | 2,389 | 309,327,143 |
| Population - 2000 | 18,546 | 2,301 | 285,036,114 |
| Population - 1990 | 16,673 | 2,039 | 251,960,433 |
| Pop. 2000 to Now | -0.5% | -2.2% | 15.6% |
| Pop. 1990 to Now | 10.7% | 10.4% | 30.8% |
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| Population Density | 443.5 | 123.9 | 93.4 |
| Land Area | 42.0 | 17.3 | 3,531,905.4 |
| Water Area | 2.2 | 1.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Montville, CT | Morris, CT | United States |
| Age 0 to 4 | 3.5% | 3.2% | 5.9% |
| Age 5 to 9 | 3.8% | 6.3% | 6.1% |
| Age 10 to 14 | 6.1% | 7.3% | 6.6% |
| Age 15 to 17 | 3.8% | 2.7% | 3.9% |
| Age 18 to 20 | 3.8% | 1.1% | 4.0% |
| Age 21 to 24 | 6.0% | 4.7% | 5.2% |
| Age 25 to 34 | 14.8% | 8.9% | 13.8% |
| Age 35 to 44 | 12.5% | 12.8% | 12.9% |
| Age 45 to 54 | 15.2% | 13.4% | 12.6% |
| Age 55 to 59 | 7.8% | 7.0% | 6.7% |
| Age 60 to 64 | 7.0% | 9.9% | 6.3% |
| Age 65 to 74 | 8.3% | 8.3% | 9.6% |
| Age 75 to 84 | 5.3% | 11.8% | 4.5% |
| Age 85 and over | 2.2% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Montville, CT | Morris, CT | United States |
| White | 76.0% | 94.5% | 59.4% |
| Black | 7.1% | 2.7% | 12.2% |
| Asian | 3.4% | 0.0% | 5.6% |
| Native American | 1.1% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.5% | 0.0% | 0.4% |
| Two or More Races | 3.3% | 1.2% | 3.2% |
| Hispanic | 8.6% | 1.2% | 18.4% |
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| Marriage & Family | | | |
| | Montville, CT | Morris, CT | United States |
| Married Population | 51.2% | 56.2% | 49.8% |
| Currently Married | 50.1% | 56.2% | 48.0% |
| Married but Separated | 1.1% | 0.0% | 1.8% |
| Single Population | 48.8% | 43.8% | 50.2% |
| Never Married | 31.5% | 22.1% | 33.8% |
| Divorced | 13.2% | 13.0% | 10.8% |
| Widowed | 4.1% | 8.7% | 5.6% |
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| Household Size | 2.60 | 2.54 | 2.60 |
| Households | 6,613 | 846 | 124,010,992 |
| Family Households | 4,800 | 562 | 80,755,759 |
| Married couple, w/children | 25.9% | 32.9% | 30.5% |
| Married couple, no children | 50.9% | 45.2% | 42.9% |
| Non Family Households | 1,813 | 284 | 43,255,233 |
| Single householder, w/children | 9.3% | 5.7% | 15.8% |
| Single householder, no children | 14.0% | 16.2% | 10.8% |