| | Calais, ME | Highgate, VT | United States |
| Population | 3,010 | 3,486 | 329,725,481 |
| Female Population | 52.2% | 46.8% | 50.5% |
| Male Population | 47.8% | 53.2% | 49.5% |
| Median Age | 51.2 | 36.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,120 | 3,540 | 309,327,143 |
| Population - 2000 | 3,447 | 3,397 | 285,036,114 |
| Population - 1990 | 3,963 | 3,020 | 251,960,433 |
| Pop. 2000 to Now | -12.2% | 7.9% | 15.6% |
| Pop. 1990 to Now | -23.6% | 21.3% | 30.8% |
| space4 | | | |
| Population Density | 87.7 | 68.7 | 93.4 |
| Land Area | 34.3 | 50.7 | 3,531,905.4 |
| Water Area | 5.8 | 9.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Calais, ME | Highgate, VT | United States |
| Age 0 to 4 | 6.5% | 4.3% | 5.9% |
| Age 5 to 9 | 1.9% | 11.6% | 6.1% |
| Age 10 to 14 | 1.6% | 5.0% | 6.6% |
| Age 15 to 17 | 4.0% | 2.2% | 3.9% |
| Age 18 to 20 | 3.8% | 7.9% | 4.0% |
| Age 21 to 24 | 3.7% | 4.2% | 5.2% |
| Age 25 to 34 | 7.4% | 10.8% | 13.8% |
| Age 35 to 44 | 9.8% | 13.1% | 12.9% |
| Age 45 to 54 | 14.1% | 9.8% | 12.6% |
| Age 55 to 59 | 6.1% | 7.8% | 6.7% |
| Age 60 to 64 | 12.2% | 9.1% | 6.3% |
| Age 65 to 74 | 13.6% | 8.3% | 9.6% |
| Age 75 to 84 | 11.1% | 3.4% | 4.5% |
| Age 85 and over | 4.3% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Calais, ME | Highgate, VT | United States |
| White | 96.0% | 93.5% | 59.4% |
| Black | 0.4% | 0.0% | 12.2% |
| Asian | 0.5% | 0.0% | 5.6% |
| Native American | 0.8% | 1.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 5.3% | 3.2% |
| Hispanic | 0.8% | 0.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Calais, ME | Highgate, VT | United States |
| Married Population | 50.7% | 62.6% | 49.8% |
| Currently Married | 49.5% | 62.6% | 48.0% |
| Married but Separated | 1.2% | 0.0% | 1.8% |
| Single Population | 49.3% | 37.4% | 50.2% |
| Never Married | 22.1% | 30.5% | 33.8% |
| Divorced | 16.8% | 3.1% | 10.8% |
| Widowed | 10.5% | 3.8% | 5.6% |
| space5 | | | |
| Household Size | 1.74 | 2.65 | 2.60 |
| Households | 1,664 | 1,313 | 124,010,992 |
| Family Households | 928 | 983 | 80,755,759 |
| Married couple, w/children | 16.7% | 29.8% | 30.5% |
| Married couple, no children | 57.0% | 55.6% | 42.9% |
| Non Family Households | 736 | 330 | 43,255,233 |
| Single householder, w/children | 21.7% | 13.1% | 15.8% |
| Single householder, no children | 4.6% | 1.4% | 10.8% |