| | Boothbay Harbor, ME | Ennis, MT | United States |
| Population | 2,073 | 673 | 329,725,481 |
| Female Population | 57.6% | 45.6% | 50.5% |
| Male Population | 42.4% | 54.4% | 49.5% |
| Median Age | 58.6 | 58.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,159 | 839 | 309,327,143 |
| Population - 2000 | 2,334 | 840 | 285,036,114 |
| Population - 1990 | 2,347 | 773 | 251,960,433 |
| Pop. 2000 to Now | -4.7% | 24.1% | 15.6% |
| Pop. 1990 to Now | -5.2% | 34.8% | 30.8% |
| space4 | | | |
| Population Density | 363.8 | 911.9 | 93.4 |
| Land Area | 5.7 | 0.7 | 3,531,905.4 |
| Water Area | 3.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Boothbay Harbor, ME | Ennis, MT | United States |
| Age 0 to 4 | 2.3% | 0.0% | 5.9% |
| Age 5 to 9 | 2.9% | 6.4% | 6.1% |
| Age 10 to 14 | 4.0% | 0.0% | 6.6% |
| Age 15 to 17 | 2.8% | 0.6% | 3.9% |
| Age 18 to 20 | 2.6% | 0.0% | 4.0% |
| Age 21 to 24 | 0.6% | 0.0% | 5.2% |
| Age 25 to 34 | 11.3% | 11.6% | 13.8% |
| Age 35 to 44 | 8.8% | 14.9% | 12.9% |
| Age 45 to 54 | 9.2% | 15.9% | 12.6% |
| Age 55 to 59 | 7.1% | 5.6% | 6.7% |
| Age 60 to 64 | 10.3% | 11.3% | 6.3% |
| Age 65 to 74 | 21.5% | 20.5% | 9.6% |
| Age 75 to 84 | 7.8% | 6.8% | 4.5% |
| Age 85 and over | 8.8% | 6.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Boothbay Harbor, ME | Ennis, MT | United States |
| White | 90.9% | 94.1% | 59.4% |
| Black | 1.4% | 0.3% | 12.2% |
| Asian | 2.1% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 2.1% | 0.4% |
| Two or More Races | 1.7% | 0.0% | 3.2% |
| Hispanic | 3.7% | 3.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Boothbay Harbor, ME | Ennis, MT | United States |
| Married Population | 49.4% | 50.6% | 49.8% |
| Currently Married | 48.7% | 46.8% | 48.0% |
| Married but Separated | 0.7% | 3.8% | 1.8% |
| Single Population | 50.6% | 49.4% | 50.2% |
| Never Married | 22.4% | 25.6% | 33.8% |
| Divorced | 16.6% | 15.4% | 10.8% |
| Widowed | 11.6% | 8.4% | 5.6% |
| space5 | | | |
| Household Size | 2.11 | 1.74 | 2.60 |
| Households | 942 | 366 | 124,010,992 |
| Family Households | 484 | 132 | 80,755,759 |
| Married couple, w/children | 18.2% | 18.9% | 30.5% |
| Married couple, no children | 60.1% | 81.1% | 42.9% |
| Non Family Households | 458 | 234 | 43,255,233 |
| Single householder, w/children | 9.7% | 0.0% | 15.8% |
| Single householder, no children | 12.0% | 0.0% | 10.8% |