| | Plainville, CT | East Hartford, CT | United States |
| Population | 17,514 | 50,971 | 329,725,481 |
| Female Population | 47.2% | 50.1% | 50.5% |
| Male Population | 52.8% | 49.9% | 49.5% |
| Median Age | 43.6 | 37.4 | 38.4 |
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| Population - 2010 | 17,684 | 50,974 | 309,327,143 |
| Population - 2000 | 17,328 | 49,575 | 285,036,114 |
| Population - 1990 | 17,392 | 50,452 | 251,960,433 |
| Pop. 2000 to Now | 0.9% | 1.7% | 15.6% |
| Pop. 1990 to Now | 0.5% | -0.1% | 30.8% |
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| Population Density | 1,803.5 | 2,832.2 | 93.4 |
| Land Area | 9.7 | 18.0 | 3,531,905.4 |
| Water Area | 0.1 | 0.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Plainville, CT | East Hartford, CT | United States |
| Age 0 to 4 | 3.4% | 6.5% | 5.9% |
| Age 5 to 9 | 4.1% | 4.8% | 6.1% |
| Age 10 to 14 | 5.5% | 6.1% | 6.6% |
| Age 15 to 17 | 3.5% | 5.1% | 3.9% |
| Age 18 to 20 | 3.5% | 4.2% | 4.0% |
| Age 21 to 24 | 5.3% | 6.1% | 5.2% |
| Age 25 to 34 | 13.2% | 13.6% | 13.8% |
| Age 35 to 44 | 13.6% | 15.0% | 12.9% |
| Age 45 to 54 | 13.5% | 12.1% | 12.6% |
| Age 55 to 59 | 6.7% | 7.6% | 6.7% |
| Age 60 to 64 | 8.2% | 6.2% | 6.3% |
| Age 65 to 74 | 10.8% | 7.7% | 9.6% |
| Age 75 to 84 | 5.5% | 3.5% | 4.5% |
| Age 85 and over | 3.5% | 1.5% | 1.9% |
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| Race | | | |
| | Plainville, CT | East Hartford, CT | United States |
| White | 80.1% | 31.7% | 59.4% |
| Black | 2.5% | 24.4% | 12.2% |
| Asian | 4.7% | 3.3% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 1.1% | 3.5% | 3.2% |
| Hispanic | 11.4% | 36.7% | 18.4% |
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| Marriage & Family | | | |
| | Plainville, CT | East Hartford, CT | United States |
| Married Population | 43.2% | 39.3% | 49.8% |
| Currently Married | 42.4% | 37.4% | 48.0% |
| Married but Separated | 0.8% | 1.8% | 1.8% |
| Single Population | 56.8% | 60.7% | 50.2% |
| Never Married | 36.5% | 44.2% | 33.8% |
| Divorced | 13.7% | 12.2% | 10.8% |
| Widowed | 6.6% | 4.4% | 5.6% |
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| Household Size | 2.17 | 2.56 | 2.60 |
| Households | 7,984 | 19,647 | 124,010,992 |
| Family Households | 4,177 | 12,618 | 80,755,759 |
| Married couple, w/children | 25.1% | 23.9% | 30.5% |
| Married couple, no children | 44.5% | 30.1% | 42.9% |
| Non Family Households | 3,807 | 7,029 | 43,255,233 |
| Single householder, w/children | 15.4% | 25.7% | 15.8% |
| Single householder, no children | 15.0% | 20.2% | 10.8% |