| | Groveton, NH | Machias, ME | United States |
| Population | 892 | 2,054 | 329,725,481 |
| Female Population | 53.6% | 52.2% | 50.5% |
| Male Population | 46.4% | 47.8% | 49.5% |
| Median Age | 37.5 | 40.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,452 | 2,214 | 309,327,143 |
| Population - 2000 | 1,197 | 2,353 | 285,036,114 |
| Population - 1990 | 1,255 | 2,569 | 251,960,433 |
| Pop. 2000 to Now | 0.8% | -21.6% | 15.6% |
| Pop. 1990 to Now | -3.8% | -28.2% | 30.8% |
| space4 | | | |
| Population Density | 433.0 | 148.1 | 93.4 |
| Land Area | 2.1 | 13.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.9 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Groveton, NH | Machias, ME | United States |
| Age 0 to 4 | 11.7% | 1.9% | 5.9% |
| Age 5 to 9 | 3.0% | 7.4% | 6.1% |
| Age 10 to 14 | 5.8% | 8.3% | 6.6% |
| Age 15 to 17 | 1.6% | 2.6% | 3.9% |
| Age 18 to 20 | 3.9% | 9.0% | 4.0% |
| Age 21 to 24 | 6.3% | 5.6% | 5.2% |
| Age 25 to 34 | 13.1% | 7.2% | 13.8% |
| Age 35 to 44 | 13.8% | 15.9% | 12.9% |
| Age 45 to 54 | 13.3% | 9.3% | 12.6% |
| Age 55 to 59 | 3.4% | 7.4% | 6.7% |
| Age 60 to 64 | 9.0% | 6.3% | 6.3% |
| Age 65 to 74 | 7.6% | 8.6% | 9.6% |
| Age 75 to 84 | 7.1% | 6.9% | 4.5% |
| Age 85 and over | 0.4% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Groveton, NH | Machias, ME | United States |
| White | 96.9% | 93.0% | 59.4% |
| Black | 0.0% | 0.8% | 12.2% |
| Asian | 0.4% | 1.1% | 5.6% |
| Native American | 0.0% | 1.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.1% | 2.4% | 3.2% |
| Hispanic | 1.6% | 0.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Groveton, NH | Machias, ME | United States |
| Married Population | 50.1% | 32.7% | 49.8% |
| Currently Married | 49.1% | 31.3% | 48.0% |
| Married but Separated | 1.0% | 1.4% | 1.8% |
| Single Population | 49.9% | 67.3% | 50.2% |
| Never Married | 28.2% | 37.3% | 33.8% |
| Divorced | 14.8% | 20.2% | 10.8% |
| Widowed | 6.9% | 9.8% | 5.6% |
| space5 | | | |
| Household Size | 2.48 | 2.23 | 2.60 |
| Households | 360 | 790 | 124,010,992 |
| Family Households | 226 | 391 | 80,755,759 |
| Married couple, w/children | 34.5% | 24.6% | 30.5% |
| Married couple, no children | 31.4% | 27.9% | 42.9% |
| Non Family Households | 134 | 399 | 43,255,233 |
| Single householder, w/children | 20.8% | 30.9% | 15.8% |
| Single householder, no children | 13.3% | 16.6% | 10.8% |