| | Swan River, MN | Union, ME | United States |
| Population | 649 | 2,738 | 329,725,481 |
| Female Population | 48.5% | 55.0% | 50.5% |
| Male Population | 51.5% | 45.0% | 49.5% |
| Median Age | 46.3 | 41.2 | 38.4 |
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| Population - 2010 | 749 | 2,259 | 309,327,143 |
| Population - 2000 | 755 | 2,209 | 285,036,114 |
| Population - 1990 | 759 | 1,989 | 251,960,433 |
| Pop. 2000 to Now | 0.8% | 3.0% | 15.6% |
| Pop. 1990 to Now | 0.3% | 14.4% | 30.8% |
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| Population Density | 17.6 | 85.2 | 93.4 |
| Land Area | 37.0 | 32.2 | 3,531,905.4 |
| Water Area | 0.8 | 2.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Swan River, MN | Union, ME | United States |
| Age 0 to 4 | 5.1% | 10.7% | 5.9% |
| Age 5 to 9 | 5.2% | 4.6% | 6.1% |
| Age 10 to 14 | 6.8% | 4.4% | 6.6% |
| Age 15 to 17 | 5.7% | 4.4% | 3.9% |
| Age 18 to 20 | 3.4% | 3.0% | 4.0% |
| Age 21 to 24 | 2.3% | 4.1% | 5.2% |
| Age 25 to 34 | 10.8% | 12.3% | 13.8% |
| Age 35 to 44 | 10.5% | 9.7% | 12.9% |
| Age 45 to 54 | 9.1% | 12.3% | 12.6% |
| Age 55 to 59 | 8.9% | 6.8% | 6.7% |
| Age 60 to 64 | 14.9% | 6.0% | 6.3% |
| Age 65 to 74 | 8.9% | 15.0% | 9.6% |
| Age 75 to 84 | 7.1% | 4.8% | 4.5% |
| Age 85 and over | 1.2% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Swan River, MN | Union, ME | United States |
| White | 97.2% | 94.8% | 59.4% |
| Black | 0.0% | 0.2% | 12.2% |
| Asian | 0.0% | 0.2% | 5.6% |
| Native American | 0.6% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.3% | 3.9% | 3.2% |
| Hispanic | 1.8% | 0.4% | 18.4% |
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| Marriage & Family | | | |
| | Swan River, MN | Union, ME | United States |
| Married Population | 61.7% | 55.8% | 49.8% |
| Currently Married | 61.7% | 54.4% | 48.0% |
| Married but Separated | 0.0% | 1.4% | 1.8% |
| Single Population | 38.3% | 44.2% | 50.2% |
| Never Married | 29.4% | 21.1% | 33.8% |
| Divorced | 5.2% | 16.8% | 10.8% |
| Widowed | 3.7% | 6.3% | 5.6% |
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| Household Size | 2.52 | 2.59 | 2.60 |
| Households | 258 | 1,041 | 124,010,992 |
| Family Households | 172 | 672 | 80,755,759 |
| Married couple, w/children | 35.5% | 40.6% | 30.5% |
| Married couple, no children | 54.7% | 45.1% | 42.9% |
| Non Family Households | 86 | 369 | 43,255,233 |
| Single householder, w/children | 2.3% | 10.1% | 15.8% |
| Single householder, no children | 7.6% | 4.2% | 10.8% |