| | Upton, ME | Brooklyn, CT | United States |
| Population | 88 | 8,421 | 329,725,481 |
| Female Population | 27.3% | 42.4% | 50.5% |
| Male Population | 72.7% | 57.7% | 49.5% |
| Median Age | 70.3 | 42.6 | 38.4 |
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| Population - 2010 | 113 | 8,216 | 309,327,143 |
| Population - 2000 | 62 | 7,173 | 285,036,114 |
| Population - 1990 | 70 | 6,681 | 251,960,433 |
| Pop. 2000 to Now | 77.4% | 15.4% | 15.6% |
| Pop. 1990 to Now | 57.1% | 23.9% | 30.8% |
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| Population Density | 2.2 | 289.2 | 93.4 |
| Land Area | 39.5 | 29.1 | 3,531,905.4 |
| Water Area | 2.3 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Upton, ME | Brooklyn, CT | United States |
| Age 0 to 4 | 0.0% | 5.7% | 5.9% |
| Age 5 to 9 | 0.0% | 4.7% | 6.1% |
| Age 10 to 14 | 0.0% | 8.6% | 6.6% |
| Age 15 to 17 | 0.0% | 3.9% | 3.9% |
| Age 18 to 20 | 0.0% | 2.2% | 4.0% |
| Age 21 to 24 | 0.0% | 4.3% | 5.2% |
| Age 25 to 34 | 2.3% | 12.9% | 13.8% |
| Age 35 to 44 | 0.0% | 9.7% | 12.9% |
| Age 45 to 54 | 5.7% | 18.5% | 12.6% |
| Age 55 to 59 | 11.4% | 5.9% | 6.7% |
| Age 60 to 64 | 10.2% | 6.3% | 6.3% |
| Age 65 to 74 | 63.6% | 9.2% | 9.6% |
| Age 75 to 84 | 5.7% | 4.8% | 4.5% |
| Age 85 and over | 1.1% | 3.4% | 1.9% |
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| Race | | | |
| | Upton, ME | Brooklyn, CT | United States |
| White | 98.9% | 85.7% | 59.4% |
| Black | 0.0% | 1.8% | 12.2% |
| Asian | 0.0% | 4.3% | 5.6% |
| Native American | 1.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 0.0% | 2.9% | 3.2% |
| Hispanic | 0.0% | 5.0% | 18.4% |
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| Marriage & Family | | | |
| | Upton, ME | Brooklyn, CT | United States |
| Married Population | 25.0% | 57.8% | 49.8% |
| Currently Married | 25.0% | 56.5% | 48.0% |
| Married but Separated | 0.0% | 1.3% | 1.8% |
| Single Population | 75.0% | 42.2% | 50.2% |
| Never Married | 2.3% | 26.6% | 33.8% |
| Divorced | 64.8% | 10.5% | 10.8% |
| Widowed | 8.0% | 5.1% | 5.6% |
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| Household Size | 1.24 | 2.79 | 2.60 |
| Households | 71 | 2,807 | 124,010,992 |
| Family Households | 13 | 2,269 | 80,755,759 |
| Married couple, w/children | 0.0% | 29.4% | 30.5% |
| Married couple, no children | 92.3% | 48.5% | 42.9% |
| Non Family Households | 58 | 538 | 43,255,233 |
| Single householder, w/children | 0.0% | 15.6% | 15.8% |
| Single householder, no children | 7.7% | 6.4% | 10.8% |