| | Brunswick, VT | Rumford, ME | United States |
| Population | 95 | 5,846 | 329,725,481 |
| Female Population | 47.4% | 49.8% | 50.5% |
| Male Population | 52.6% | 50.2% | 49.5% |
| Median Age | 60.1 | 51.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 103 | 5,828 | 309,327,143 |
| Population - 2000 | 107 | 6,472 | 285,036,114 |
| Population - 1990 | 92 | 7,078 | 251,960,433 |
| Pop. 2000 to Now | -5.6% | -11.4% | 15.6% |
| Pop. 1990 to Now | 9.8% | -19.0% | 30.8% |
| space4 | | | |
| Population Density | 3.7 | 85.3 | 93.4 |
| Land Area | 25.5 | 68.5 | 3,531,905.4 |
| Water Area | 0.5 | 1.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Brunswick, VT | Rumford, ME | United States |
| Age 0 to 4 | 3.2% | 1.8% | 5.9% |
| Age 5 to 9 | 4.2% | 3.0% | 6.1% |
| Age 10 to 14 | 0.0% | 5.3% | 6.6% |
| Age 15 to 17 | 0.0% | 3.7% | 3.9% |
| Age 18 to 20 | 2.1% | 2.6% | 4.0% |
| Age 21 to 24 | 2.1% | 3.7% | 5.2% |
| Age 25 to 34 | 5.3% | 7.8% | 13.8% |
| Age 35 to 44 | 13.7% | 12.0% | 12.9% |
| Age 45 to 54 | 11.6% | 16.7% | 12.6% |
| Age 55 to 59 | 7.4% | 9.2% | 6.7% |
| Age 60 to 64 | 20.0% | 13.1% | 6.3% |
| Age 65 to 74 | 15.8% | 13.4% | 9.6% |
| Age 75 to 84 | 12.6% | 6.1% | 4.5% |
| Age 85 and over | 2.1% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Brunswick, VT | Rumford, ME | United States |
| White | 100.0% | 97.3% | 59.4% |
| Black | 0.0% | 0.2% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 1.6% | 3.2% |
| Hispanic | 0.0% | 0.3% | 18.4% |
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| Marriage & Family | | | |
| | Brunswick, VT | Rumford, ME | United States |
| Married Population | 75.0% | 43.3% | 49.8% |
| Currently Married | 72.7% | 42.0% | 48.0% |
| Married but Separated | 2.3% | 1.3% | 1.8% |
| Single Population | 25.0% | 56.7% | 50.2% |
| Never Married | 10.2% | 29.1% | 33.8% |
| Divorced | 1.1% | 20.5% | 10.8% |
| Widowed | 13.6% | 7.2% | 5.6% |
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| Household Size | 2.11 | 2.39 | 2.60 |
| Households | 45 | 2,416 | 124,010,992 |
| Family Households | 33 | 1,282 | 80,755,759 |
| Married couple, w/children | 12.1% | 24.5% | 30.5% |
| Married couple, no children | 78.8% | 54.8% | 42.9% |
| Non Family Households | 12 | 1,134 | 43,255,233 |
| Single householder, w/children | 6.1% | 12.1% | 15.8% |
| Single householder, no children | 3.0% | 8.7% | 10.8% |