| | Harwinton, CT | Elmira, NY | United States |
| Population | 5,499 | 26,737 | 329,725,481 |
| Female Population | 46.9% | 50.1% | 50.5% |
| Male Population | 53.1% | 49.9% | 49.5% |
| Median Age | 49.3 | 35.8 | 38.4 |
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| Population - 2010 | 5,640 | 29,258 | 309,327,143 |
| Population - 2000 | 5,283 | 30,940 | 285,036,114 |
| Population - 1990 | 5,228 | 33,724 | 251,960,433 |
| Pop. 2000 to Now | 2.2% | -12.6% | 15.6% |
| Pop. 1990 to Now | 3.3% | -19.8% | 30.8% |
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| Population Density | 178.6 | 3,686.9 | 93.4 |
| Land Area | 30.8 | 7.3 | 3,531,905.4 |
| Water Area | 0.3 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Harwinton, CT | Elmira, NY | United States |
| Age 0 to 4 | 3.9% | 4.7% | 5.9% |
| Age 5 to 9 | 5.9% | 6.5% | 6.1% |
| Age 10 to 14 | 8.7% | 7.8% | 6.6% |
| Age 15 to 17 | 3.5% | 3.4% | 3.9% |
| Age 18 to 20 | 1.7% | 5.4% | 4.0% |
| Age 21 to 24 | 3.9% | 5.0% | 5.2% |
| Age 25 to 34 | 6.1% | 16.0% | 13.8% |
| Age 35 to 44 | 10.2% | 13.1% | 12.9% |
| Age 45 to 54 | 17.0% | 11.4% | 12.6% |
| Age 55 to 59 | 9.6% | 7.1% | 6.7% |
| Age 60 to 64 | 7.9% | 5.4% | 6.3% |
| Age 65 to 74 | 12.6% | 9.2% | 9.6% |
| Age 75 to 84 | 7.1% | 2.8% | 4.5% |
| Age 85 and over | 1.9% | 2.1% | 1.9% |
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| Race | | | |
| | Harwinton, CT | Elmira, NY | United States |
| White | 96.1% | 74.9% | 59.4% |
| Black | 1.1% | 11.7% | 12.2% |
| Asian | 0.2% | 1.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.6% | 0.4% |
| Two or More Races | 1.5% | 6.0% | 3.2% |
| Hispanic | 1.2% | 5.6% | 18.4% |
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| Marriage & Family | | | |
| | Harwinton, CT | Elmira, NY | United States |
| Married Population | 60.5% | 37.2% | 49.8% |
| Currently Married | 59.8% | 33.9% | 48.0% |
| Married but Separated | 0.7% | 3.3% | 1.8% |
| Single Population | 39.5% | 62.8% | 50.2% |
| Never Married | 20.4% | 44.5% | 33.8% |
| Divorced | 12.8% | 13.1% | 10.8% |
| Widowed | 6.3% | 5.1% | 5.6% |
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| Household Size | 2.67 | 2.36 | 2.60 |
| Households | 2,053 | 9,871 | 124,010,992 |
| Family Households | 1,633 | 5,603 | 80,755,759 |
| Married couple, w/children | 26.9% | 24.8% | 30.5% |
| Married couple, no children | 51.4% | 33.0% | 42.9% |
| Non Family Households | 420 | 4,268 | 43,255,233 |
| Single householder, w/children | 12.2% | 29.6% | 15.8% |
| Single householder, no children | 9.4% | 12.6% | 10.8% |