| | Plainfield, CT | New Milford, CT | United States |
| Population | 14,991 | 28,074 | 329,725,481 |
| Female Population | 49.5% | 53.0% | 50.5% |
| Male Population | 50.5% | 47.0% | 49.5% |
| Median Age | 41.5 | 42.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 15,400 | 28,067 | 309,327,143 |
| Population - 2000 | 14,619 | 27,121 | 285,036,114 |
| Population - 1990 | 14,363 | 23,629 | 251,960,433 |
| Pop. 2000 to Now | 3.2% | -1.6% | 15.6% |
| Pop. 1990 to Now | 5.0% | 12.9% | 30.8% |
| space4 | | | |
| Population Density | 353.8 | 455.9 | 93.4 |
| Land Area | 42.4 | 61.6 | 3,531,905.4 |
| Water Area | 0.6 | 2.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Plainfield, CT | New Milford, CT | United States |
| Age 0 to 4 | 7.2% | 5.7% | 5.9% |
| Age 5 to 9 | 4.7% | 5.8% | 6.1% |
| Age 10 to 14 | 4.0% | 5.4% | 6.6% |
| Age 15 to 17 | 3.0% | 4.6% | 3.9% |
| Age 18 to 20 | 1.6% | 3.6% | 4.0% |
| Age 21 to 24 | 3.8% | 3.9% | 5.2% |
| Age 25 to 34 | 16.7% | 11.9% | 13.8% |
| Age 35 to 44 | 12.4% | 11.7% | 12.9% |
| Age 45 to 54 | 13.8% | 14.5% | 12.6% |
| Age 55 to 59 | 7.7% | 7.9% | 6.7% |
| Age 60 to 64 | 9.6% | 9.5% | 6.3% |
| Age 65 to 74 | 8.8% | 10.0% | 9.6% |
| Age 75 to 84 | 5.0% | 4.2% | 4.5% |
| Age 85 and over | 1.8% | 1.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Plainfield, CT | New Milford, CT | United States |
| White | 89.3% | 82.5% | 59.4% |
| Black | 4.0% | 2.4% | 12.2% |
| Asian | 1.9% | 2.9% | 5.6% |
| Native American | 0.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.1% | 0.4% |
| Two or More Races | 1.5% | 2.9% | 3.2% |
| Hispanic | 2.9% | 9.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Plainfield, CT | New Milford, CT | United States |
| Married Population | 54.3% | 55.4% | 49.8% |
| Currently Married | 51.7% | 54.5% | 48.0% |
| Married but Separated | 2.6% | 0.8% | 1.8% |
| Single Population | 45.7% | 44.6% | 50.2% |
| Never Married | 29.6% | 28.7% | 33.8% |
| Divorced | 11.2% | 11.1% | 10.8% |
| Widowed | 5.0% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.45 | 2.61 | 2.60 |
| Households | 6,045 | 10,656 | 124,010,992 |
| Family Households | 4,016 | 7,708 | 80,755,759 |
| Married couple, w/children | 24.7% | 30.9% | 30.5% |
| Married couple, no children | 49.7% | 48.5% | 42.9% |
| Non Family Households | 2,029 | 2,948 | 43,255,233 |
| Single householder, w/children | 16.9% | 12.5% | 15.8% |
| Single householder, no children | 8.7% | 8.0% | 10.8% |