| | Millinocket, ME | Castleton, VT | United States |
| Population | 4,127 | 4,605 | 329,725,481 |
| Female Population | 54.3% | 54.7% | 50.5% |
| Male Population | 45.8% | 45.3% | 49.5% |
| Median Age | 57.4 | 35.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,499 | 4,712 | 309,327,143 |
| Population - 2000 | 5,203 | 4,367 | 285,036,114 |
| Population - 1990 | 6,956 | 4,278 | 251,960,433 |
| Pop. 2000 to Now | -18.4% | 2.8% | 15.6% |
| Pop. 1990 to Now | -39.0% | 5.0% | 30.8% |
| space4 | | | |
| Population Density | 258.8 | 118.4 | 93.4 |
| Land Area | 15.9 | 38.9 | 3,531,905.4 |
| Water Area | 2.3 | 3.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Millinocket, ME | Castleton, VT | United States |
| Age 0 to 4 | 2.9% | 2.1% | 5.9% |
| Age 5 to 9 | 8.7% | 4.2% | 6.1% |
| Age 10 to 14 | 0.9% | 7.1% | 6.6% |
| Age 15 to 17 | 2.4% | 3.7% | 3.9% |
| Age 18 to 20 | 3.2% | 15.9% | 4.0% |
| Age 21 to 24 | 1.4% | 8.4% | 5.2% |
| Age 25 to 34 | 11.5% | 5.9% | 13.8% |
| Age 35 to 44 | 6.6% | 8.0% | 12.9% |
| Age 45 to 54 | 9.2% | 10.4% | 12.6% |
| Age 55 to 59 | 8.0% | 9.4% | 6.7% |
| Age 60 to 64 | 9.4% | 6.2% | 6.3% |
| Age 65 to 74 | 21.9% | 10.0% | 9.6% |
| Age 75 to 84 | 11.7% | 5.5% | 4.5% |
| Age 85 and over | 2.2% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Millinocket, ME | Castleton, VT | United States |
| White | 99.7% | 95.0% | 59.4% |
| Black | 0.0% | 1.5% | 12.2% |
| Asian | 0.0% | 0.4% | 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 | 0.3% | 1.6% | 3.2% |
| Hispanic | 0.0% | 1.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Millinocket, ME | Castleton, VT | United States |
| Married Population | 56.2% | 32.8% | 49.8% |
| Currently Married | 54.2% | 31.3% | 48.0% |
| Married but Separated | 2.1% | 1.6% | 1.8% |
| Single Population | 43.8% | 67.2% | 50.2% |
| Never Married | 16.5% | 47.3% | 33.8% |
| Divorced | 19.2% | 11.2% | 10.8% |
| Widowed | 8.1% | 8.7% | 5.6% |
| space5 | | | |
| Household Size | 1.89 | 2.20 | 2.60 |
| Households | 2,164 | 1,685 | 124,010,992 |
| Family Households | 1,262 | 762 | 80,755,759 |
| Married couple, w/children | 13.1% | 24.0% | 30.5% |
| Married couple, no children | 64.1% | 46.6% | 42.9% |
| Non Family Households | 902 | 923 | 43,255,233 |
| Single householder, w/children | 21.8% | 13.9% | 15.8% |
| Single householder, no children | 1.0% | 15.5% | 10.8% |